Presbyopia is the age-associated progressive loss of the focusing power of the lens, resulting in difficulty seeing objects close to the eye. The focusing power of the eye, which depends upon the inherent elasticity of the lens, is gradually lost with the aging process.

If you have diabetes mellitus, your body does not use sugar properly. High blood-sugar levels can damage blood vessels in the retina. This is called diabetic retinopathy. There are two major types of diabetic retinopathy: non proliferative diabetic retinopathy (NPDR) and proliferative diabetic retinopathy (PDR). Many diabetics have mild NPDR.