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Answer:
due to ageing the physical senses and properties like eye's power become weak and slowly it starts to work weak in old people.
The most common causes of vision loss among the elderly are age-related macular degeneration, glaucoma, cataract and diabetic retinopathy. Age-related macular degeneration is characterized by the loss of central vision. Primary open-angle glaucoma results in optic nerve damage and visual field loss