Question

give the meaning of least distance of distinct vision

Answer 1

In optometry, the least distance of distinct vision (LDDV) or the reference seeingdistance (RSD) is the closest someone with "normal" vision (20/20 vision) can comfortably look at something. In other words, LDDV is the minimum comfortabledistance between the naked human eyeand a visible object.

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Answer 2

it is the least distance before which we can't see the objects. It is 25cm for a normal human eye