Presbyopia is a common age-related condition that reduces the eye's ability to focus on close objects. It occurs because the lens of the eye hardens and loses flexibility, and the muscles surrounding the lens become less effective at changing the lens's shape for focusing on near vision (a process called accommodation). This results in blurred vision when reading or doing other close-up tasks.
An elderly person while trying to read a book at about 25 cm from the eyes finds the image appears blurred because of the decreasing effectiveness of the ciliary muscles and the loss of flexibility of the lens. This defect of the eyes is called
Asked in UPSC CAPF 2011 · Topic: Deficiency, Non-Contagious and Other Diseases (Degenerative Neurological Disorders (e.g., Alzheimer's, Parkinson's))
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