{"id":8577,"date":"2020-10-11T19:19:32","date_gmt":"2020-10-11T19:19:32","guid":{"rendered":"https:\/\/www.optometrists.org\/?page_id=8577"},"modified":"2021-07-15T12:24:03","modified_gmt":"2021-07-15T12:24:03","slug":"ocular-anatomy-the-front-of-the-eye","status":"publish","type":"page","link":"https:\/\/www.optometrists.org\/general-practice-optometry\/guide-to-eye-health\/how-does-the-eye-work\/ocular-anatomy-the-front-of-the-eye\/","title":{"rendered":"Eye Anatomy: The Front of the Eye"},"content":{"rendered":"<h2><b>Did you know that the eye is made up of over 2 million parts, each contributing a distinct vital role in your ability to see?<\/b><\/h2>\n<p>The eye is a complicated organ (second in its complexity to the brain), and <a href=\"https:\/\/www.optometrists.org\/categories\/eyecare-for-adults-101\/how-does-the-eye-work\/\">all of its parts need to work in perfect harmony<\/a> to enable you to see the world around you.<\/p>\n<p><i>The following ocular structures lie within the outer and middle layers of the eye, also known as the anterior area of the eye.\u00a0<\/i><\/p>\n<h2><b>Sclera<\/b><\/h2>\n<p><b>The outermost layer of the eye consists of the sclera, also known as the white part of the eye<\/b>.<\/p>\n<p>The sclera is made up of tough fibrous tissue and is responsible for giving the eye it\u2019s round shape and protecting the inner structures of the eye. The sclera is thickest in the back of the eye as it provides extra protection to the area around the optic nerve.<\/p>\n<p>The sclera consists of three parts:<\/p>\n<ul>\n<li style=\"font-weight: 400;\">Episclera- the loose connective tissue located directly under the conjunctiva<\/li>\n<li style=\"font-weight: 400;\">Sclera proper- the dense white tissue that gives the sclera its white color<\/li>\n<li style=\"font-weight: 400;\">Lamina fusca- the innermost area that consists of elastic fibers<\/li>\n<\/ul>\n<p>The sclera at the front of the eye is covered with a protective tissue called the conjunctiva.<\/p>\n<h2><b>Conjunctiva\u00a0<\/b><\/h2>\n<p>The conjunctiva is the thin, clear tissue that covers the sclera and cornea, and wraps around the entire front of the eye, connecting the eye to the underside of the eyelids.<\/p>\n<p><b>The conjunctival connection of the sclera to the eyelids prevents any objects from \u201cgetting lost behind the eye\u201d\u2014 a common concern of first time contact lens users<\/b>.<\/p>\n<p>The conjunctiva lubricates the eyeball and allows the eyelids to easily slide over the surface of the eye upon blinking. This tissue is highly vascularized and can become inflamed or infected easily.<\/p>\n<p>When the conjunctival vessels become swollen, the eye appears red or pink\u2014 this is generally caused by an infection called <a href=\"https:\/\/www.optometrists.org\/dry-eye\/conjunctivitis-and-eye-infections\/\">conjunctivitis,<\/a> also known as \u201cpink eye\u201d.<\/p>\n<p>Often, the conjunctiva can become red from other conditions as well, such as <a href=\"https:\/\/www.optometrists.org\/dry-eye\/what-is-dry-eye-syndrome\/\">dry eyes<\/a> and <a href=\"https:\/\/www.optometrists.org\/dry-eye\/allergies\/\">eye allergies<\/a>.<\/p>\n<p>If you suspect you have an eye condition,\u00a0<a rel=\"noopener\" href=\"https:\/\/www.optometrists.org\/practice-search\/\" target=\"_blank\" data-saferedirecturl=\"https:\/\/www.google.com\/url?q=https:\/\/www.optometrists.org\/practice-search\/&amp;source=gmail&amp;ust=1626436974964000&amp;usg=AFQjCNG_wx_u48AzmMdgLd8cP_CE2se3YA\"><b>contact an eye doctor<\/b><\/a>\u00a0near you, who can diagnose and treat the condition.<\/p>\n<p><strong>SEE RELATED:<\/strong> <a href=\"https:\/\/www.optometrists.org\/general-practice-optometry\/guide-to-eye-health\/how-does-the-eye-work\/eye-anatomy-external-parts-of-the-eye\/\">Eye Anatomy: External Parts of the Eye<\/a><\/p>\n\n\t<div class=\"practice-search-widget\">\n\t\t<h3>Find an eye doctor near you<\/h3>\n\t\t\n\t<form class=\"practice-search-form practice-search-form-widget\" action=\"https:\/\/www.optometrists.org\/practice-search\/results\/\" method=\"get\">\n\n\t\t<input type=\"hidden\" name=\"distance\" value=\"100\" class=\"practice-search-distance\">\n\t\t<input type=\"hidden\" name=\"page\" class=\"practice-search-page\">\n\t\t<input type=\"hidden\" name=\"address_latitude\"><input type=\"hidden\" name=\"address_longitude\">\n\n\t\t<input type=\"text\" name=\"address\" class=\"practice-search-address\" placeholder=\"City, Surburb or Address\" value=\"\">\n\n\t\t\n\t\t\t<input type=\"hidden\" name=\"distance\" value=\"100\" class=\"practice-search-distance\">\n\n\t\t\n\n\t\t<button type=\"submit\" class=\"practice-search-button\">\n\t\t\t\t\t\t\t\t\t<svg width=\"19\" height=\"19\" viewBox=\"0 0 19 19\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path fill-rule=\"evenodd\" clip-rule=\"evenodd\" d=\"M10.6796 0.130005C9.15708 0.130059 7.66615 0.5646 6.38198 1.38258C5.09781 2.20057 4.07373 3.36803 3.43004 4.74783C2.78634 6.12763 2.54976 7.66246 2.74808 9.17205C2.9464 10.6816 3.57139 12.1033 4.54964 13.27L0.729639 17.08C0.6364 17.1732 0.562439 17.2839 0.511979 17.4058C0.461519 17.5276 0.435547 17.6581 0.435547 17.79C0.435547 17.9219 0.461519 18.0524 0.511979 18.1743C0.562439 18.2961 0.6364 18.4068 0.729639 18.5C0.917942 18.6883 1.17334 18.7941 1.43964 18.7941C1.5715 18.7941 1.70207 18.7681 1.82389 18.7177C1.94571 18.6672 2.0564 18.5932 2.14964 18.5L5.99964 14.62C7.35406 15.6038 8.98566 16.1324 10.6596 16.13C12.7814 16.13 14.8162 15.2871 16.3165 13.7869C17.8168 12.2866 18.6596 10.2517 18.6596 8.13C18.6596 6.00827 17.8168 3.97344 16.3165 2.47315C14.8162 0.97286 12.7814 0.130005 10.6596 0.130005H10.6796ZM10.6796 14.13C9.49295 14.13 8.33291 13.7781 7.34622 13.1188C6.35952 12.4595 5.59049 11.5225 5.13636 10.4261C4.68224 9.32975 4.56342 8.12335 4.79493 6.95946C5.02644 5.79558 5.59788 4.72648 6.437 3.88736C7.27611 3.04825 8.34521 2.4768 9.5091 2.24529C10.673 2.01378 11.8794 2.1326 12.9757 2.58673C14.0721 3.04085 15.0092 3.80989 15.6685 4.79658C16.3277 5.78328 16.6796 6.94332 16.6796 8.13C16.6796 9.7213 16.0475 11.2474 14.9223 12.3726C13.7971 13.4979 12.2709 14.13 10.6796 14.13Z\" fill=\"#fff\"\/><\/svg>\n\t\t\t\t\t<\/button>\n\n\t\t<button type=\"button\" class=\"practice-search-use-my-location\">\n\t\t\tSearch near me\n\t\t<\/button>\n\n\n\t<\/form>\n\n\n\n\t\t<\/div>\n\n\t\n<h2><b>Cornea<\/b><\/h2>\n<p>The cornea is the clear outer layer of the eye that protects the eye from harmful particles and ultraviolet rays.<\/p>\n<p><b>This part of the eye is also responsible for bending the light that enters the eye. <\/b><b>The cornea\u2019s shape or curvature determines the eye\u2019s focusing abilities for both near and distant objects.<\/b><\/p>\n<p>The cornea is the area of the eye that <a href=\"https:\/\/www.optometrists.org\/general-practice-optometry\/optical\/guide-to-contact-lenses\/\">contact lenses<\/a> are positioned, and the tissue that <a href=\"https:\/\/www.optometrists.org\/optical\/laser-refractive-surgery\/\">LASIK surgery<\/a> is performed on.<\/p>\n<p>The cornea receives its oxygen from the environment and does not contain any blood vessels (avascular). This enables light to easily pass through for clear vision.<\/p>\n<p>The cornea consists of five layers:<\/p>\n<ul>\n<li style=\"font-weight: 400;\">Epithelium- As the outermost layer of the cornea, this layer prevents harmful particles from entering the eye and absorbs oxygen and nutrients from the tears.<\/li>\n<li style=\"font-weight: 400;\">Bowman\u2019s layer- This layer maintains the cornea\u2019s shape.<\/li>\n<li style=\"font-weight: 400;\">Stroma- As the central layer of the cornea, this layer is by far the thickest. It is made up of collagen fibers, water and proteins that give the cornea an elastic but solid and strong consistency.<\/li>\n<li style=\"font-weight: 400;\">Descemet&#8217;s membrane- This layer is the resting layer for endothelial cells.<\/li>\n<li style=\"font-weight: 400;\">Endothelium- This layer works as a pump, removing the waste products and excess water from the cornea and depositing them into the fluid of the anterior chamber to prevent vision problems.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.optometrists.org\/general-practice-optometry\/eye-conditions\/guide-to-eye-conditions\/corneal-diseases\/\">Corneal disease<\/a> or infection can affect the cornea\u2019s ability to function normally, and cause vision loss and even blindness.<\/p>\n<h2><b>Anterior chamber<\/b><\/h2>\n<p>The anterior chamber is located between the cornea and the iris.<\/p>\n<p><b>The anterior chamber is filled with a clear fluid called aqueous humor which helps to maintain the shape of the eye and provide nourishment to the ocular structures.<\/b><\/p>\n<p>The aqueous humor flows out of the anterior chamber through the trabecular meshwork. As new fluid is produced, the \u201cold\u201d fluid drains out. If there is a problem within the trabecular meshwork and the fluid cannot drain properly, or the fluid is being produced faster than it can drain out, the <a href=\"https:\/\/www.optometrists.org\/general-practice-optometry\/guide-to-eye-exams\/why-is-eye-pressure-important\/\">pressure within the eye can increase.\u00a0<\/a><\/p>\n<p>When this happens, a serious eye disease called <a href=\"https:\/\/www.optometrists.org\/general-practice-optometry\/eye-conditions\/glaucoma-guide\/glaucoma\/\">glaucoma<\/a>, can develop.<\/p>\n<h2><b>Trabecular meshwork<\/b><\/h2>\n<p>The trabecular meshwork is made up of connective tissue and is located between the iris and the cornea.<\/p>\n<p><b>This tissue is responsible for draining the aqueous fluid from the front of the eye into the veins of the eye, and eventually into the bloodstream.\u00a0<\/b><\/p>\n<p><a href=\"https:\/\/www.optometrists.org\/general-practice-optometry\/eye-conditions\/glaucoma-guide\/how-is-glaucoma-treated\/\">Glaucoma surgery<\/a> is typically focused on the trabecular meshwork, with the goal of opening up any blockages and reducing eye pressure.<\/p>\n<h2><b>Pupil<\/b><\/h2>\n<p><b>The pupil is the black hole in the center of the iris through which light can enter the eye.\u00a0<\/b><\/p>\n<p>The pupil controls the amount of light that enters the eye by widening and constricting in response to the intensity of the light. The size of the pupil is controlled by the muscles in the iris around it.<\/p>\n<p>If the pupil does not dilate or constrict in response to light, it may signal a neurological problem.<\/p>\n<p>During an <a href=\"https:\/\/www.optometrists.org\/general-practice-optometry\/comprehensive-eye-exams\/\">eye exam<\/a>, the pupils are dilated with the use of special <a href=\"https:\/\/www.optometrists.org\/dry-eye\/guide-to-eye-drops\/\">eye drops<\/a> in order to allow the eye doctor to examine the inner structures and the retina in the back of the eye.<\/p>\n<h2><b>Iris<\/b><\/h2>\n<p>The iris is the pigmented part of the eye that encompasses the pupil. The iris contains muscles that adjust the pupil\u2019s size in response to light intensity.<\/p>\n<p><b>The color of the iris is what gives us green, blue, hazel, brown or dark colored eyes.<\/b><\/p>\n<p>The color of the iris is also determined by the amount of pigment cells in the muscles\u2014 a higher amount of pigment leads to a darker iris, less pigment leads to a lighter iris. As a result, people with lighter eyes are more sensitive to light, as their eyes don\u2019t contain the dark pigment that protects them from bright lights that enter the eye.<\/p>\n<h2><b>Ciliary body<\/b><\/h2>\n<p>The ciliary body is a muscle that is located behind the iris.<\/p>\n<p><b>This muscle is responsible for focusing, also known as accommodation, and changes the shape of the eye\u2019s lens.\u00a0<\/b><\/p>\n<p>This response allows us to shift our focus between near and distant objects.<\/p>\n<p>The ciliary body also contains cells that produce the aqueous humor (fluid) located in the anterior chamber. If the ciliary body produces too much fluid, or if the fluid does not drain out of the anterior chamber fast enough, the pressure within the eye can rise. High pressure within the eye can cause glaucoma.<\/p>\n<h2><b>Uvea<\/b><\/h2>\n<p><b>The uvea is responsible for transporting blood to the retina, and consists of the three inner structures beneath the sclera: the iris, ciliary body, and the choroid.\u00a0<\/b><\/p>\n<p>Uveitis is a condition that can occur when the uvea becomes inflamed, and is typically caused by an autoimmune disease, viral infection, or eye injury.<\/p>\n<p>In most cases, uveitis does not cause any serious problems, but vision loss can occur if severe cases are left untreated.<\/p>\n<h2><b>Lens\u00a0<\/b><\/h2>\n<p>The lens is located behind the iris and is responsible for bending the light it receives from the cornea, and focusing that light onto the retina.<\/p>\n<p><b>The lens changes its shape to enable you to shift focus and see clear images at all distances<\/b>.<\/p>\n<p>As we age, the crystalline lens begins to harden and lose its flexibility, causing <a href=\"https:\/\/www.optometrists.org\/optical\/presbyopia\/\">presbyopia<\/a>\u2014 the reason why many people wear <a href=\"https:\/\/www.optometrists.org\/optical\/guide-to-bifocals-and-multifocals\/\">reading glasses<\/a> as they get older.<\/p>\n<p>Additionally, over time, the lens becomes cloudy, causing a condition called <a href=\"https:\/\/www.optometrists.org\/general-practice-optometry\/eye-conditions\/guide-to-cataracts\/cataracts\/\">cataracts<\/a>. Cataracts usually develop slowly over time and can be treated with <a href=\"https:\/\/www.optometrists.org\/general-practice-optometry\/eye-conditions\/guide-to-cataracts\/cataract-surgery-what-to-expect\/\">cataract surgery<\/a> as they begin to impact daily living.<\/p>\n<p><strong>LEARN MORE:\u00a0<\/strong>\u00a0<a href=\"https:\/\/www.optometrists.org\/general-practice-optometry\/guide-to-eye-health\/\">Guide to Eye Health<\/a><\/p>\n<p><a rel=\"noopener\" href=\"https:\/\/www.optometrists.org\/practice-search\/\" target=\"_blank\" data-saferedirecturl=\"https:\/\/www.google.com\/url?q=https:\/\/www.optometrists.org\/practice-search\/&amp;source=gmail&amp;ust=1626436974964000&amp;usg=AFQjCNG_wx_u48AzmMdgLd8cP_CE2se3YA\"><b>Schedule an appointment<\/b><\/a> with an eye doctor for a comprehensive eye exam, and to discuss any questions you may have about your eyes and eye health.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Did you know that the eye is made up of over 2 million parts, each contributing a distinct vital role in your ability to see?<\/p>\n","protected":false},"author":4,"featured_media":8578,"parent":8573,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"template-article.php","meta":{"footnotes":""},"categories":[],"tags":[132,109,86,407,147],"class_list":["post-8577","page","type-page","status-publish","has-post-thumbnail","hentry","tag-acuity","tag-binocular","tag-education","tag-eye","tag-eye-exam"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.9 - 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