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Presbyopia is the condition in which the lens of the eye loses its ability to focus, typically making it difficult to see objects up close, especially in poor lighting. It's caused (generally) by a loss of elasticity of the lens and loss of muscle function within the eye -- making it take longer to focus, having to hold reading materials further away, etc. Typically happens to middle-agers. In fact, the word basically means "old man eyes" in its Greek roots.
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