Final answer:
A cataract is a condition where the lens of the eye becomes cloudy, causing vision loss. Cataracts are treated by replacing the clouded lens with an artificial one.
Step-by-step explanation:
A medical condition in which the lens of the eye becomes white is known as a cataract. Cataracts involve the clouding of the lens, resulting in a loss of vision. Treatment usually involves replacing the clouded lens with an artificial one.
When discussing a cataract, light is diffused by the cloudiness in the lens. This diffusion scatters light entering the eye and leads to impaired vision. On the topic of laser vision correction for repairing tears in the retina, the rays entering the eye must be parallel to ensure precise focusing on the affected area, thus enabling the laser to spot-weld the retina effectively without damaging other parts of the eye.
It is also noted that repeated exposure to UV-B may lead to the formation of cataracts, thus the importance of using sunglasses for protection against UV rays is emphasized.