Low vision means having a visual impairment, not correctable by standard glasses, contact lenses, medicine, or surgery that interferes with the ability to perform everyday activities easily.
What causes low vision?

Low vision can result from a variety of diseases, disorders, and injuries that affect the eye. Many people with low vision have age-related macular degeneration, cataracts, glaucoma, or diabetic retinopathy. Age-related macular degeneration accounts for almost 45 percent of all cases of low vision.