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Q. What is the value of the Least Distance of Distinct vision(in cm) for a normal human being?
Answer: 25
Notes: 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. The range of vision of a healthy human eye is between it's near point and far point i.e, from 25cm to infinity.
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