{"id":3230,"date":"2023-01-09T10:12:58","date_gmt":"2023-01-09T10:12:58","guid":{"rendered":"https:\/\/10thclass.deltapublications.in\/?page_id=3230"},"modified":"2025-01-01T03:24:37","modified_gmt":"2025-01-01T03:24:37","slug":"s-11-a-the-human-eye","status":"publish","type":"page","link":"https:\/\/10thclass.deltapublications.in\/index.php\/s-11-a-the-human-eye\/","title":{"rendered":"s-11.a The Human Eye"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center has-text-color\" style=\"color:#00056d;text-transform:uppercase\"><strong>The Human Eye<\/strong><\/h2>\n\n\n\n<p class=\"has-text-color has-link-color has-huge-font-size wp-elements-f79afd6ea8b322268468366b8e5f7cc7\" style=\"color:#74008b\"><strong>Key Notes:<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-text-color has-background has-link-color wp-elements-ea4ccf8e3400b7cddf4d1e5cf6316499\" style=\"color:#000060;background-color:#dfc816\"><strong>Structure of the Human Eye:<\/strong><\/h3>\n\n\n\n<div class=\"wp-block-group has-large-font-size\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<ul class=\"wp-block-list\">\n<li><strong>Cornea<\/strong>: The transparent, curved outer layer of the eye that helps focus light entering the eye.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-60-1-1024x640.png\" alt=\"\" class=\"wp-image-16878\" style=\"width:462px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-60-1-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-60-1-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-60-1-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-60-1-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-60-1-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-60-1.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Pupil<\/strong>: The black circular opening in the center of the iris that controls the amount of light entering the eye.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-61-1-1024x640.png\" alt=\"\" class=\"wp-image-16880\" style=\"width:484px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-61-1-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-61-1-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-61-1-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-61-1-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-61-1-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-61-1.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Iris<\/strong>: The colored part of the eye that controls the size of the pupil, regulating the amount of light that enters.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-62-1-1024x640.png\" alt=\"\" class=\"wp-image-16882\" style=\"width:480px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-62-1-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-62-1-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-62-1-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-62-1-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-62-1-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-62-1.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Lens<\/strong>: A transparent, flexible, and convex structure that focuses light onto the retina.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-63-1024x640.png\" alt=\"\" class=\"wp-image-16885\" style=\"width:482px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-63-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-63-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-63-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-63-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-63-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-63.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Retina<\/strong>: The innermost layer of the eye, which contains light-sensitive cells (rods and cones) that convert light into electrical signals.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-64-3-1024x640.png\" alt=\"\" class=\"wp-image-16887\" style=\"width:492px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-64-3-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-64-3-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-64-3-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-64-3-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-64-3-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-64-3.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Optic Nerve<\/strong>: The nerve that transmits electrical signals from the retina to the brain for visual processing.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-65-1-1024x640.png\" alt=\"\" class=\"wp-image-16889\" style=\"width:496px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-65-1-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-65-1-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-65-1-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-65-1-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-65-1-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-65-1.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ciliary Muscles<\/strong>: Muscles that change the shape of the lens to focus on objects at different distances (accommodation).<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-66-1-1024x640.png\" alt=\"\" class=\"wp-image-16891\" style=\"width:502px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-66-1-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-66-1-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-66-1-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-66-1-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-66-1-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-66-1.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-text-color has-background has-link-color wp-elements-7d778306014e6e7933346f2ddfb2b221\" style=\"color:#000060;background-color:#dfc816\"> <strong>Function of the Eye:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Light Entry<\/strong>: Light enters the eye through the <strong>cornea<\/strong>, then passes through the <strong>pupil<\/strong> (which adjusts based on light intensity).<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-78-1-1024x640.png\" alt=\"\" class=\"wp-image-16916\" style=\"width:392px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-78-1-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-78-1-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-78-1-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-78-1-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-78-1-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-78-1.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Focusing<\/strong>: The <strong>lens<\/strong> focuses light on the <strong>retina<\/strong>. The lens changes shape with the help of the ciliary muscles to focus on near or distant objects.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-79-1-1024x640.png\" alt=\"\" class=\"wp-image-16918\" style=\"width:424px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-79-1-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-79-1-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-79-1-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-79-1-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-79-1-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-79-1.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Image Formation<\/strong>: The light-sensitive <strong>rods<\/strong> and <strong>cones<\/strong> in the retina convert light into electrical signals. <strong>Rods<\/strong> are responsible for low-light vision (night vision), while <strong>cones<\/strong> detect colors and are responsible for daytime vision.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-80-1-1024x640.png\" alt=\"\" class=\"wp-image-16920\" style=\"width:432px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-80-1-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-80-1-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-80-1-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-80-1-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-80-1-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-80-1.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Signal Transmission<\/strong>: These signals are sent to the <strong>brain<\/strong> via the <strong>optic nerve<\/strong>, where they are interpreted as images.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-text-color has-background has-link-color wp-elements-eb3a3391512668f269c7fa4551af88f4\" style=\"color:#000060;background-color:#dfc816\"><strong>Accommodation:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The process by which the eye changes the shape of the <strong>lens<\/strong> to focus on objects at different distances.<\/li>\n\n\n\n<li>When focusing on a <strong>near object<\/strong>, the ciliary muscles contract, causing the lens to become more curved (increasing its refractive power).<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-76-1-1024x640.png\" alt=\"\" class=\"wp-image-16912\" style=\"width:470px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-76-1-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-76-1-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-76-1-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-76-1-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-76-1-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-76-1.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li>When focusing on a <strong>distant object<\/strong>, the ciliary muscles relax, making the lens flatter (decreasing its refractive power).<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-77-1-1024x640.png\" alt=\"\" class=\"wp-image-16914\" style=\"width:444px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-77-1-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-77-1-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-77-1-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-77-1-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-77-1-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-77-1.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-text-color has-background has-link-color wp-elements-b3e36eb9a473b5e012202d60799b5a5d\" style=\"color:#000060;background-color:#dfc816\"><strong>Defects of the Eye:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Myopia (Nearsightedness)<\/strong>: The inability to see distant objects clearly. It occurs when the eyeball is too long or the lens is too curved.\n<ul class=\"wp-block-list\">\n<li>Correction: Concave lenses are used to diverge light rays before they enter the eye.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-72-1-1024x640.png\" alt=\"\" class=\"wp-image-16904\" style=\"width:456px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-72-1-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-72-1-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-72-1-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-72-1-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-72-1-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-72-1.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Hypermetropia (Farsightedness)<\/strong>: The inability to see nearby objects clearly. It occurs when the eyeball is too short or the lens is too flat.\n<ul class=\"wp-block-list\">\n<li>Correction: Convex lenses are used to converge light rays before they enter the eye.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-73-1-1024x640.png\" alt=\"\" class=\"wp-image-16906\" style=\"width:498px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-73-1-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-73-1-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-73-1-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-73-1-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-73-1-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-73-1.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Astigmatism<\/strong>: Distorted or blurred vision caused by an irregular shape of the cornea or lens.\n<ul class=\"wp-block-list\">\n<li>Correction: Cylindrical lenses are used to correct the uneven curvature.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-74-1-1024x640.png\" alt=\"\" class=\"wp-image-16908\" style=\"width:524px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-74-1-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-74-1-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-74-1-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-74-1-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-74-1-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-74-1.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Presbyopia<\/strong>: The age-related loss of the ability to focus on near objects due to the hardening of the lens.\n<ul class=\"wp-block-list\">\n<li>Correction: Bifocal or multifocal lenses.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-75-1-1024x640.png\" alt=\"\" class=\"wp-image-16910\" style=\"width:482px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-75-1-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-75-1-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-75-1-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-75-1-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-75-1-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-75-1.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-text-color has-background has-link-color wp-elements-a7ed338c18ef4fd9684f2c4dfc3a731f\" style=\"color:#000060;background-color:#dfc816\"><strong>Color Vision:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Cones<\/strong> in the retina are responsible for color vision. There are three types of cones sensitive to red, green, and blue light.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-70-1-1024x640.png\" alt=\"\" class=\"wp-image-16900\" style=\"width:454px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-70-1-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-70-1-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-70-1-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-70-1-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-70-1-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-70-1.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Color Blindness<\/strong>: A condition where one or more types of cones are absent or non-functional, leading to the inability to distinguish certain colors (most commonly red and green).<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-71-1-1024x640.png\" alt=\"\" class=\"wp-image-16902\" style=\"width:440px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-71-1-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-71-1-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-71-1-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-71-1-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-71-1-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-71-1.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-text-color has-background has-link-color wp-elements-e1375ff3c76841df6aff26d7993882eb\" style=\"color:#000060;background-color:#dfc816\"><strong>Working of the Eye in Detail:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Light enters the <strong>eye<\/strong> through the <strong>cornea<\/strong> and passes through the <strong>pupil<\/strong>.<\/li>\n\n\n\n<li>The amount of light entering is controlled by the <strong>iris<\/strong> (which adjusts the size of the pupil).<\/li>\n\n\n\n<li>The light is then <strong>focused<\/strong> by the <strong>lens<\/strong> onto the <strong>retina<\/strong> at the back of the eye.<\/li>\n\n\n\n<li>The <strong>retina<\/strong> contains <strong>rods<\/strong> (for black and white vision in low light) and <strong>cones<\/strong> (for color vision in bright light).<\/li>\n\n\n\n<li>These cells convert the light signals into electrical impulses, which are sent to the <strong>brain<\/strong> via the <strong>optic nerve<\/strong>.<\/li>\n\n\n\n<li>The brain interprets these impulses, and you perceive the image.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-text-align-center has-text-color has-background has-link-color wp-elements-6aeb5a1557837ad751289bf7d7915f7b\" style=\"color:#000060;background-color:#dfc816\"> <strong>Protecting Your Eyes:<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Avoid<\/strong> staring directly at bright lights (like the sun or welding arcs) to prevent damage to the retina.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-67-1024x640.png\" alt=\"\" class=\"wp-image-16866\" style=\"width:494px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-67-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-67-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-67-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-67-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-67-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-67.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Wear protective eyewear<\/strong> when working with harmful chemicals or machinery.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-68-1-1024x640.png\" alt=\"\" class=\"wp-image-16896\" style=\"width:492px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-68-1-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-68-1-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-68-1-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-68-1-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-68-1-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-68-1.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Maintain good lighting<\/strong> and avoid prolonged exposure to screens (to prevent eye strain).<\/li>\n\n\n\n<li><strong>Eat foods rich in Vitamin A<\/strong> (like carrots) to maintain good eye health.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"640\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-69-1-1024x640.png\" alt=\"\" class=\"wp-image-16898\" style=\"width:494px;height:auto\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-69-1-1024x640.png 1024w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-69-1-300x188.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-69-1-768x480.png 768w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-69-1-1536x960.png 1536w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-69-1-1568x980.png 1568w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2025\/01\/Untitled-design-69-1.png 1600w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<div class=\"wp-block-group has-large-font-size\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-text-color\" style=\"color:#d90000\"><strong>Let&#8217;s Practise!<\/strong><\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/wordwall.net\/play\/83070\/103\/525\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-3-45.png\" alt=\"\" class=\"wp-image-5577\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-3-45.png 500w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-3-45-300x300.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-3-45-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/wordwall.net\/play\/81512\/718\/693\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-2-45.png\" alt=\"\" class=\"wp-image-5578\" srcset=\"https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-2-45.png 500w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-2-45-300x300.png 300w, https:\/\/10thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-2-45-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>The Human Eye Key Notes: Structure of the Human Eye: Function of the Eye: Accommodation: Defects of the Eye: Color Vision: Working of the Eye in Detail: Protecting Your Eyes: Let&#8217;s Practise!<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-3230","page","type-page","status-publish","hentry","entry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/10thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3230","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/10thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/10thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/10thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/10thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/comments?post=3230"}],"version-history":[{"count":21,"href":"https:\/\/10thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3230\/revisions"}],"predecessor-version":[{"id":16921,"href":"https:\/\/10thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3230\/revisions\/16921"}],"wp:attachment":[{"href":"https:\/\/10thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/media?parent=3230"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}