What is meant by presbyopia and which symbol we use for measuring focal length?
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Definition of presbyopia
: a visual condition which becomes apparent especially in middle age and in which loss of elasticity of the lens of the eye causes defective accommodation and inability to focus sharply for near vision
(f)we use for measuring focal length
: a visual condition which becomes apparent especially in middle age and in which loss of elasticity of the lens of the eye causes defective accommodation and inability to focus sharply for near vision
(f)we use for measuring focal length
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