PRESBYOPIA: Presbyopia usually occurs beginning at around age 40, when people experience blurred near vision when reading, sewing or working at the computer.
You can't escape presbyopia, even if you've never had a vision problem before. Even people who are nearsighted will notice that their near vision blurs when they wear their usual eyeglasses or contact lenses to correct distance vision.
Presbyopia is widespread in the United States. According to U.S. Census Bureau data, over 135 million Americans were age 40 and older in 2008, and the country is growing older: The median age reached 36.8 in 2008, up 1.5 years since 2000. This growing number of older citizens generates a huge demand for eyewear, contact lenses and surgery that can help presbyopes deal with their failing near vision.
More than a billion people in the world were presbyopic as of 2005, according to the World Health Organization, and 517 million of these did not have adequate correction with eyeglasses. In developing countries, glasses are available in urban areas, but in rural regions they are unavailable or expensive. This is unfortunate, because good near vision is important for literacy and for performing closeup work.
MAKULA DEGENERANCE (Yellow Spot Disease): Age-related deterioration of the visual center causes fogginess in the visual center. Reason of fogginess is the degeneration of macula which is a small region behind the eye. Macula helps you to see the small details of the focus point of your eyes.
Macular degeneration makes it difficult to do things that require sharp central vision like reading, driving and recognizing faces. It does not affect side vision therefore does not cause a complete blindness.
for details: YELLOW SPOT DISEASE
GLOKOM: Glocom is an illness which occurs by damage in visual nerves because of rising inner eye pressure. During initial period of the disease, patient does not have any complaint for a long time but meanwhile optic nerve is worn out and when the patient notices the situation, it may have come to a irreparable level.
for details: OCULAR PRESSURE
CATARACT: The structure and operation of the eye is very similar to an electronic camera. Cataract is a clouding of the lens inside the eye which leads to a decrease in vision. Visual loss occurs because of the opacification of the lens.
for details: CATARACT