what is presbiopia. how it is caused.
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Presbyopia is caused by a hardening of the lens of your eye, which occurs with aging. As your lens becomes less flexible, it can no longer change shape to focus on close-up images. As a result, these images appear out of focus.,
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long-sightedness caused by loss of elasticity of the lens of the eye, occurring typically in middle and old age.
This differs from astigmatism, nearsightednessand farsightedness, which are related to the shape of the eyeball and are caused by genetic and environmental factors. Presbyopia generally is believed to stem from a gradual thickening and loss of flexibility of the natural lens inside your eye.
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