What is presbyopia?

Presbyopia is a type of vision defect. With normal vision we can see clearly because the elastic lens of the eye changes shape (becomes thicker) when we view objects nearby. The light rays focus on the retina. But in presbyopia or near-vision, the lens lose their elasticity and the light rays from a closely-held object are focused behind the retina, causing defective vision. Presbyopia is a perfectly natural condition which will affect all of us as we become older. It develops slowly so we may not be aware of its early stages.

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