Graphical construction of cardinal points from the transference

African Vision and Eye Health

Field Value
Title Graphical construction of cardinal points from the transference
Creator Harris, W. F.
Subject — Cardinal point, nodal point; principal point; focal point; transference
Description Usually nodal, principal and focal points are defined independently and thought of as distinct structures with no simple relationship among them.  By adopting a holistic approach, in which these threetypes of cardinal points are treated as particular cases of a larger class of special points, this paper develops a method of constructing the locations of the cardinal points of a system graphically directly from the transference.  The method provides a useful way of visualising the relationship of the locations of the cardinal points and of how they are affected by changes in the system or when a second optical system is placed in front of the first.  Thepaper illustrates the graphical procedure by apply-ing it in several situations of interest in optometryand ophthalmology, including the effect of a contact lens or refractive surgery on a reduced eye and the effect of accommodation, a spectacle lens and an afocal telescope on the Gullstrand-Emsleyschematic eye. (S Afr Optom 2011 70(1) 3-13)
Publisher AOSIS
Date 2011-12-10
Type info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion — —
Format application/pdf
Identifier 10.4102/aveh.v70i1.88
Source African Vision and Eye Health; South African Optometrist: Vol 70, No 1 (2011); 3-13 2410-1516 2413-3183
Language eng
Coverage — — —
Rights Copyright (c) 2011 W. F. Harris