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Video Description: Cataract, video illustration. A cataract is a clouding of the lens in your eye that affects vision. Most cataracts are related to aging. To understand how a cataract can affect your vision, it helps to understand a little about the structure of your eye. The lens is clear and lies between the iris and the pupil. It works much like a camera lens, focusing light, or an image, on the retina. The retina is the light-sensitive tissue at the back of the eye. Once the light or image reaches the retina, it is changed into nerve signals that are sent to the brain. Besides focusing light on the retina, the lens also adjusts the eye's focus, letting us see things clearly both up close and far away. The lens must be clear for the retina to receive a sharp image. The lens is made of mostly water and protein. The protein is arranged in a precise way that allows light to pass through it without distortion. But as we age, proteins in the lens clump together, causing a cataract. At first the protein may clump together and cloud in small area of the lens. Over time, the clumps may increase in size and number, clouding more of the lens. If the lens is cloudy from a cataract, the image you see will be blurred and colors may appear faded.
Credit: National Eye Institute, National Institutes of Health

View Animation (Quicktime)
Ref#: VA08

An acute sudden onset cortical cataract in a person with Type 1 (juvenile) diabetes Description: An acute sudden onset cortical cataract in a person with Type 1 (juvenile) diabetes.
Credit: National Eye Institute, National Institutes of Health
Ref#: EDA12
72 dpi
(704K, TIFF)
150 dpi
(2.8M, TIFF)

A hypermature age-related cortico-nuclear cataract with a brunescent (brown) nucleus. Description: A hypermature age-related cortico-nuclear cataract with a brunescent (brown) nucleus.
Credit: National Eye Institute, National Institutes of Health
Ref#: EDA13
72 dpi
(721K, TIFF)
150 dpi
(2.9M, TIFF)

A white congenital cataract. Description: A white congenital cataract.
Credit: National Eye Institute, National Institutes of Health
Ref#: EDA14
72 dpi
(354K, TIFF)
150 dpi
(1.4M, TIFF)

A scene as it might be viewed by a person with cataract. Description: A scene as it might be viewed by a person with cataract.

Normal view of this image.
Credit: National Eye Institute, National Institutes of Health
Ref#: EDS03

72 dpi
(463K, TIFF)
150 dpi
(1.9M, TIFF)
300 dpi
(7.9M, TIFF)

Cataratas. Description: Cataratas. La lente del ojo se nubla y se ve borroso.

Vea la versión normal de esta imagen.
Credit: National Eye Institute, National Institutes of Health
Ref#: EDS10

72 dpi
(529K, TIFF)
150 dpi
(2.2M, TIFF)
300 dpi
(9.0M, TIFF)


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Department of Health and Human Services NIH, the National Institutes of Health USA.gov