VISUAL MAPPING UNDER HIGH AMETROPIA - A C OMPUTER-AIDED SIMULATION USING RAY-TRACING

Citation
W. Fink et al., VISUAL MAPPING UNDER HIGH AMETROPIA - A C OMPUTER-AIDED SIMULATION USING RAY-TRACING, Klinische Monatsblatter fur Augenheilkunde, 208(6), 1996, pp. 472-476
Citations number
14
Categorie Soggetti
Ophthalmology
Journal title
Klinische Monatsblatter fur Augenheilkunde
ISSN journal
00232165 → ACNP
Volume
208
Issue
6
Year of publication
1996
Pages
472 - 476
Database
ISI
SICI code
0023-2165(1996)208:6<472:VMUHA->2.0.ZU;2-I
Abstract
Purpose A computer program developed by the authors allows to calculat e the path of light rays coming from an object through all the refract ive surfaces of a Gullstrand model eve until it reaches the retina, Me thod The program calculates several hundred light rays for every point of a given object. A menue allows to modify optical and morphological parameters in an interactive way. For instance, the indices of refrac tion, the radii of the cornea and of the cristalline lens, as well as the length of the bulbus can be modified, Further, one can add seeing aids such as eve glasses or a contact lens, or implant an artificial i ntraocular lens, The seeing aids may be decentered and/or tilted. Resu lts The code calculates also the visual impression by projecting the i mage from the retina back to a screen at the distance of the object, w here the human brain ''sees'' the object, For image interpretation we use a normal Gullstrand eye with a very small aperture stop, Tn this w ay we can simulate the visual mapping (visual impression) of a correct ed or uncorrected ametropia. Conclusions In this paper we present two nontrivial examples: we calculate the regional polyopia (''Bildverdopp elung'') and the annular scotoma which appear whenever a high myopia o r aphakia are corrected by eye glasses.