Don't have unreasonable expectations. A hearing aid or other device won't cure everything. As a result, less light enters the eye, and we develop problems with glare and color perception. Overall, though, most of us retain relatively good vision as we age. By far the most common cause of visual disability in the elderly.
Peripheral vision remains unaffected.
The cause of macular degeneration isn't really known. Second most common cause. Defects in the eye's drainage system result in a buildup of fluid, causing increased pressure in the eye. Glaucoma is treated with medication or eye drops. Clouding of the lens of the eye, resulting in blurred or dim vision.