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2025-02-26 13:17:41 -05:00

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<title>Cataracts and the Eye | National Eye Institute</title>
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<span>Cataracts and the Eye</span>
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<p>A cataract is a cloudy area in the lens of your eye that can cause vision problems. Click or tap the image below to explore how cataracts affect the eye. Look at the different parts of the eye and see the difference between mild, moderate, and severe cataracts.</p>
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<g id="side_lens_shape" data-name="side lens shape">
<g id="sl_main" data-name="sl main">
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</g>
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</g>
<g id="side_lens_highlight" data-name="side lens highlight">
<g id="sl_main_hl" data-name="sl main hl">
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</g>
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</g>
<g id="side_mild_condition" data-name="side mild condition">
<g id="smc_main" data-name="smc main">
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</g>
<g id="side_moderate_condition" data-name="side moderate condition">
<g id="smodc_main" data-name="smodc main">
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</g>
<path id="smodc_light" data-name="smodc light" class="cls-side-23" d="m150.09,94.61c-1.18-5.3-7.65,23.34-8.07,35.76-.81,23.62,7.47,48.45,7.96,45.71.46-2.57-6.25-25.21-6.24-43.08,0-19.11,6.71-36.78,6.35-38.38Z"/>
</g>
<g id="side_severe_condition" data-name="side severe condition">
<g id="ssc_main" data-name="ssc main">
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</g>
<path id="ssc_light" data-name="ssc light" class="cls-side-24" d="m150.09,94.61c-1.18-5.3-7.65,23.34-8.07,35.76-.81,23.62,7.47,48.45,7.96,45.71.46-2.57-6.25-25.21-6.24-43.08,0-19.11,6.71-36.78,6.35-38.38Z"/>
</g>
<g id="side_optic_nerve_shape" data-name="side optic nerve shape">
<path id="son" class="cls-side-3" d="m379.66,167.76c-.59,4.09,0,17.74,0,17.74-15.8-.48-25.94-3.25-28.87-4.22-12.99-4.32-26.14-11.55-26.14-11.55-3.47-2.12-1.55-15.38,5.43-18.75.48-.23,5.57,3.38,8,4.75,5.24,2.98,10.69,6.6,17.01,8.38,13.07,3.68,24.57,3.64,24.57,3.64Z"/>
<path id="son_btm_line" data-name="son btm line" class="cls-side-15" d="m331.41,173.76c29.67,13.83,48.18,11.49,48.18,11.49"/>
<path id="son_top_line" data-name="son top line" class="cls-side-15" d="m337.19,155.21c.86.14,11.85,6.97,19.52,9.11,10.8,3.02,22.95,3.44,22.95,3.44"/>
</g>
<g id="side_optic_nerve_highlight" data-name="side optic nerve highlight">
<path id="son_hl" data-name="son hl" class="cls-side-3" d="m379.66,167.76c-.59,4.09,0,17.74,0,17.74-15.8-.48-25.94-3.25-28.87-4.22-12.99-4.32-26.14-11.55-26.14-11.55-3.47-2.12-1.55-15.38,5.43-18.75.48-.23,5.57,3.38,8,4.75,5.24,2.98,10.69,6.6,17.01,8.38,13.07,3.68,24.57,3.64,24.57,3.64Z"/>
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</g>
<path id="side_cornea_shape" data-name="side cornea shape" class="cls-side-5" d="m136.22,179.07c-33.18-21.82-29.43-74.79,3.15-96.84,3.48-2.36,7.49-2.64,10.73-4l-10.17-.06c-41.13,21.89-45.67,76.59-5.53,104.59h8.85c.52-1.23-6.03-2.49-7.03-3.69Z"/>
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<g id="side_iris_shape" data-name="side iris shape">
<path id="si_top" data-name="si top" class="cls-side-12" d="m133.04,119.5c1.11-2.09,1.57-17.38,18.89-41.33,0,0-4.18-.63-8.25,4.51-13.61,17.15-16.85,35.04-16.85,35.04-.37,4.11,4.3,5.36,6.2,1.79Z"/>
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</g>
<g id="side_iris_highlight" data-name="side iris highlight">
<path id="si_top_hl" data-name="si top hl" class="cls-side-12" d="m133.04,119.5c1.11-2.09,1.57-17.38,18.89-41.33,0,0-4.18-.63-8.25,4.51-13.61,17.15-16.85,35.04-16.85,35.04-.37,4.11,4.3,5.36,6.2,1.79Z"/>
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</g>
<g id="pupil_highlight" data-name="pupil highlight">
<g>
<path class="cls-side-10" d="m129.38,122.5c-.02.12-.04.25-.06.37"/>
<path class="cls-side-14" d="m128.98,125.41c-.43,3.56-.61,6.82-.68,8.69"/>
<path class="cls-side-10" d="m128.26,135.37c0,.24,0,.37,0,.37"/>
</g>
</g>
</g>
<g id="side_labels_wrapper" class="side_labels_wrapper" data-name="side labels wrapper">
<g id="side_sclera_label" data-name="side sclera label">
<line class="cls-side-16" x1="61.75" y1="39.77" x2="164.64" y2="57.56"/>
<a xlink:href="#" aria-label="Sclera">
<g>
<rect class="cls-side-11" x="13.8" y="29.05" width="49.73" height="22.27" rx="3.37" ry="3.37"/>
<text class="cls-side-7" transform="translate(23.5 44.71)">Sclera</text>
</g>
</a>
</g>
<g id="side_cornea_label" data-name="side cornea label">
<line class="cls-side-16" x1="67.51" y1="72.29" x2="118.01" y2="101.13"/>
<a xlink:href="#" aria-label="Cornea">
<g>
<rect class="cls-side-11" x="13.8" y="61.85" width="53.5" height="22.27" rx="3.37" ry="3.37"/>
<text class="cls-side-7" transform="translate(20.81 76.95)">Cornea</text>
</g>
</a>
</g>
<g id="side_iris_label" data-name="side iris label">
<line class="cls-side-16" x1="48.26" y1="106.65" x2="132.75" y2="110.13"/>
<a xlink:href="#" aria-label="Iris">
<g>
<rect class="cls-side-11" x="13.8" y="94.66" width="40.53" height="22.27" rx="3.37" ry="3.37"/>
<text class="cls-side-7" transform="translate(25.89 110.14)">Iris</text>
</g>
</a>
</g>
<g id="side_pupil_label" data-name="side pupil label">
<line class="cls-side-16" x1="61.28" y1="141.02" x2="127.75" y2="129.12"/>
<a xlink:href="#" aria-label="Pupil">
<g>
<rect class="cls-side-11" x="13.8" y="127.46" width="48.8" height="22.27" rx="3.37" ry="3.37"/>
<text class="cls-side-7" transform="translate(24.95 143)">Pupil</text>
</g>
</a>
</g>
<g id="side_lens_label" data-name="side lens label">
<line class="cls-side-16" x1="61.28" y1="172.02" x2="158.64" y2="131.01"/>
<a xlink:href="#" aria-label="Lens">
<g>
<rect class="cls-side-11" x="13.8" y="160.27" width="48.8" height="22.27" rx="3.37" ry="3.37"/>
<text class="cls-side-7" transform="translate(25.91 175.66)">Lens</text>
</g>
</a>
</g>
<g id="side_retina_label" data-name="side retina label">
<line class="cls-side-16" x1="318.06" y1="79.26" x2="368.24" y2="35.86"/>
<a xlink:href="#" aria-label="Retina">
<g>
<rect class="cls-side-11" x="360.85" y="29.05" width="63.39" height="22.27" rx="3.37" ry="3.37"/>
<text class="cls-side-7" transform="translate(375.65 44.54)">Retina</text>
</g>
</a>
</g>
<g id="side_optic_nerve_label" data-name="side optic nerve label">
<line class="cls-side-16" x1="360.85" y1="172.77" x2="403.59" y2="86.67"/>
<a xlink:href="#" aria-label="Optic Nerve">
<g>
<rect class="cls-side-11" x="360.85" y="66.57" width="89.17" height="22.27" rx="3.37" ry="3.37"/>
<text class="cls-side-7" transform="translate(373.2 82.08)">Optic Nerve</text>
</g>
</a>
</g>
</g>
</svg>
</div>
<div id="descriptions" class="descriptions-wrapper">
<div id="optic_nerve-description" class="part-description" data-highlight="optic_nerve" aria-hidden="true">
<h3>Optic Nerve</h3>
<p>The optic nerve sends signals from the retina to the brain, which turns them into the images you see. Because cataracts make it harder for the eye to focus light on the retina, the optic nerve can't send clear signals to the brain. That's why your vision is blurry, hazy, or less colorful when you have cataracts.</p>
<button class="close-description" aria-label="Close optic nerve description">&times;</button>
</div>
<div id="retina-description" class="part-description" data-highlight="retina" aria-hidden="true">
<h3>Retina</h3>
<p>The retina is the light-sensitive layer of tissue at the back of the eye. Cataracts can make it harder for the lens of your eye to focus light on the retina.</p>
<button class="close-description" aria-label="Close retina description">&times;</button>
</div>
<div id="sclera-description" class="part-description" data-highlight="sclera" aria-hidden="true">
<h3>Sclera</h3>
<p>The sclera is the layer of white tissue that covers most of the outside of the eye. It helps your eye keep its shape and protects it from injury.</p>
<button class="close-description" aria-label="Close sclera description">&times;</button>
</div>
<div id="cornea-description" class="part-description" data-highlight="cornea" aria-hidden="true">
<h3>Cornea</h3>
<p>The cornea is the clear front layer of the eye. The cornea works with the lens (where cataracts happen) to help focus light on the retina.</p>
<button class="close-description" aria-label="Close cornea description">&times;</button>
</div>
<div id="iris-description" class="part-description" data-highlight="iris" aria-hidden="true">
<h3>Iris</h3>
<p>The iris is the colored part of the eye that controls how much light the pupil lets in.</p>
<button class="close-description" aria-label="Close iris description">&times;</button>
</div>
<div id="pupil-description" class="part-description" data-highlight="pupil" aria-hidden="true">
<h3>Pupil</h3>
<p>The pupil is an opening in the eye just inside the cornea. After light passes through the cornea, some of the light enters the pupil and goes through the lens.</p>
<button class="close-description" aria-label="Close pupil description">&times;</button>
</div>
<div id="lens-description" class="part-description" data-highlight="lens" aria-hidden="true">
<h3>Lens</h3>
<p>The lens is the clear inner part of the eye that helps focus light on the retina. A cataract is a cloudy area in the lens of your eye.</p>
<button class="close-description" aria-label="Close lens description">&times;</button>
</div>
</div>
<div class="mobile-wrapper">
<p class="options-label">Eye parts</p>
<ul class="mobile-list" id="quarter_sclera_label_b">
<li><button class="mobile-target" data-target="sclera" href="#sclera-description" aria-controls="sclera-description" aria-expanded="false">Sclera</button></li>
<li><button class="mobile-target" data-target="cornea" href="#cornea-description" aria-controls="cornea-description" aria-expanded="false">Cornea</button></li>
<li><button class="mobile-target" data-target="iris" href="#iris-description" aria-controls="iris-description" aria-expanded="false">Iris</button></li>
<li><button class="mobile-target" data-target="pupil" href="#pupil-description" aria-controls="pupil-description" aria-expanded="false">Pupil</button></li>
<li><button class="mobile-target" data-target="lens" href="#lens-description" aria-controls="lens-description" aria-expanded="false">Lens</button></li>
<li><button class="mobile-target" data-target="retina" href="#retina-description" aria-controls="retina-description" aria-expanded="false">Retina</button></li>
<li><button class="mobile-target" data-target="optic_nerve" href="#optic_nerve-description" aria-controls="optic_nerve-description" aria-expanded="false">Optic nerve</button></li>
</ul>
</div>
<div class="panel-controls-wrapper">
<p id="panel-labels" class="options-label">View</p>
<ul class="c-panel__controls" aria-labelledby="panel-labels">
<li class="panel-control-item"><a href="#quarter" id="quarter" class="c-panel__control quarter"><img src="/themes/custom/nei/images/ieg-icon-front.png" alt="" /><span class="text">Front</span><span class="visually-hidden"> view of the eye graphic</span></a></li>
<li class="panel-control-item"><a href="#side" id="side" class="c-panel__control side"><img src="/themes/custom/nei/images/ieg-icon-side.png" alt="" /><span class="text">Side</span><span class="visually-hidden"> view of the eye graphic</span></a></li>
</ul>
</div>
</div>
<div class="conditions-wrapper">
<p class="options-label">Cataract Severity</p>
<ul class="condition-list">
<li><button role="button" class="condition-target" aria-pressed="false" data-condition-target="none">None</button></li>
<li><button role="button" class="condition-target" aria-pressed="false" data-condition-target="mild">Mild</button></li>
<li><button role="button" class="condition-target" aria-pressed="false" data-condition-target="moderate">Moderate</button></li>
<li><button role="button" class="condition-target" aria-pressed="false" data-condition-target="severe">Severe</button></li>
</ul>
</div>
</div>
</article>
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<p class="views-element-container c-last-updated" id="block-views-block-nei-last-updated-block-1"><strong>Last updated:</strong> August 24, 2023</p>
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