The lens of the human eye is similar to the lens of a camera. Located near the front of the eye, the lens focuses light on the retina at the back of the eye. Light passes through it to produce a sharp image on the retina. When the lens of the eye becomes cloudy, light is unable to pass through it and the vision is blurred. This condition is known as cataract.
Human Eye Anatomy
How do they occur?
Cataracts are usually a natural part of aging. They can exist at birth, be caused by injury, or be caused by diseases like diabetes. Cataracts usually develop in both eyes, although not always at the same rate.
How do they affect you?
Cataracts often take a number of years to develop and may not cause problems in their early stages. Cataracts progress at varying rates from individual to individual. But as they develop they can reduce sight and interfere with lifestyle. You will notice a blurring of vision, with activities like driving and reading becoming more difficult. Sometimes your eyes make become more sensitive to light and glare.