Psychology -> Old age
Cataracts result in blurred or distorted vision. IMAGE
The process of ageing can effect visual perception in a number of ways. Deterioration of any of the structures of the eye can take place, affecting the ability to see clearly.
One condition that may arise as a result of old age is cataracts. A cataract is a clouding of all or part of the normally clear lens within the eye, which results in blurred or distorted vision. Cataracts are most often found in people over 55 years of age, but they are also occasionally found in younger people. Cataracts are also related to a high blood sugar level, therefore diabetics have a higher chance of developing them at an earlier age.
No one knows exactly what causes cataracts, but it is known that a chemical change occurs within the eye to cause the lens to become cloudy. This may be due to advancing age, heredity, injury or disease. Although cataracts develop without pain or discomfort, there are some indications that a cataract may be forming. These include blurred or hazy vision, the appearance of spots in front of the eyes and an increased sensitivity to glare or the feeling of having a film over the eyes. A temporary improvement in near vision may also indicate formation of a cataract.
If cataracts develop to the point where they affect the person's daily activities, surgery is recommended. This is when the eye's natural lens is removed and usually replaced with a plastic artificial lens.