Poor eyesight (far sightedness), age related after turning 40 or so. Corrective glasses (bifocals) is the preferred treatment! There are refractive surgical treatments as well, notably monovision surgery.
Presbyopia is farsightedness that occurs when the eyes age. Reading glasses are the "cure". My understanding is that attempts to correct via surgery have not been successful. (I was at my eye dr yesterday and that is what she told me.)
"Presbyopia is generally believed to stem from a gradual loss of flexibility in the natural lens inside your eye. The eye's lens hardens with age, resulting in blurred near vision. This is called presbyopia.
"These age-related changes occur within the proteins in the lens, making the lens harder and less elastic with the years. Age-related changes also take place in the muscle fibers surrounding the lens. With less elasticity, the eye has a harder time focusing up close. Other, less popular theories exist as well." http://www.allaboutvision.com/conditions/presbyopia.htm
Market Data 
Markets 
