What is meant by least distance of distinct vision? Mention its value
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(a) It is defined as the minimum distance between the eye lens and the object to form a clear image. (b) For young people the least distance of distinct vision is less and for old it is more.
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In optometry, the least distance of distinct vision (LDDV) or the reference seeing distance (RSD) is the closest someone with "normal" vision (20/20 vision) can comfortably look at something. In other words, LDDV is the minimum comfortable distance between the naked human eye and a visible object.
Hope it helps. Jai Shri Krishna
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