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Normal eye and eye with cataract, illustration
Illustration showing in side sectional view the distribution and effect of light through the lens of a healthy human eye (top) and an eye with cataracts (bottom). Cataract is a condition in which the lens of the eye loses its transparency. They are a natural feature of ageing, but can also be caused by injury to the eye or certain diseases, such as diabetes. It leads to progressive loss of vision and may result in blindness., by JOE BROCK, RESEARCH ILLUSTRATION, FRANCIS CRICK INSTITUTE/SCIENCE PHOTO LIBRARY
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