This excerpt taken from the ACL 6-K filed Feb 25, 2005.
Age-related macular degeneration is an eye disease that causes damage to the macula the light-sensitive cells at the center of the retina at the back of the eye. The macula is responsible for central vision, allowing people to perceive colors sharply and to see with enough detail to read, drive, watch television and perform other activities that require focused, straight-ahead vision. Central vision enables people to maintain independence in daily activities.
There are two types of AMD dry, or non-exudative, and wet, or exudative. Although the wet form of AMD constitutes only 10-15 percent of all AMD cases, it is responsible for 90 percent of blindness attributable to this condition. Today, wet AMD is the leading cause of blindness in industrialized nations in people over the age of 50.