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.[1] In other words, LDDV is the minimum comfortable distance between the naked human eye and a visible object.
The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror.
The magnifying power (M) of a lens with focal length (f in millimeters) when viewed by the naked human eye can be calculated as:
least, distance, distinct, vision, optometry, least, distance, distinct, vision, lddv, reference, seeing, distance, closest, someone, with, normal, vision, vision, comfortably, look, something, other, words, lddv, minimum, comfortable, distance, between, naked. 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 1 In other words LDDV is the minimum comfortable distance between the naked human eye and a visible object The focal point F and focal length f of a positive convex lens a negative concave lens a concave mirror and a convex mirror The magnifying power M of a lens with focal length f in millimeters when viewed by the naked human eye can be calculated as M 250f displaystyle M frac 250 f See also editOptometry Far point Snellen chart Visual perception Visual impairmentReferences edit Katz Milton August 1996 Convergence Demands by Spectacle Magnifiers Optometry and Vision Science 73 8 540 545 doi 10 1097 00006324 199608000 00004 ISSN 1538 9235 PMID 8869985 S2CID 21041392 nbsp This optics related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Least distance of distinct vision amp oldid 1131320271, wikipedia, wiki, book, books, library,
