Dislocation of intraocular lens analysed by means of ray tracing

W. Fink, A. Frohn, E. W. Schmid

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Purpose. Patients report several optical phenomena under conditions of dislocated intraocular lenses. As soon as the lens border covers the pupillary rim, a halo appears in the percepted image. Increasing dislocation causes diplopia, because a second pupil is formed. To analyse these phenomena, the method of ray tracing was applied. Methods. By means of ray tracing the path of light rays is calculated between an object and the retina passing refractive surfaces of an improved Gullstrand eye model. The image formed on the retina is projected back to a virtual screen at the distance of the object to give an impression of the retinal image formation. Results. To study the effects of transversal lens dislocations digitized images of realistic scenes were processed with the ray tracer to simulate the evoked image distortion. The amount of diplopic disparation and halo effects can be analysed dependent on the angle of view. Conclusions. Ray tracing is a useful tool for visualization and analysis of optical problems within patients eyes. Not only the known phenomena like diplopia are verified, but distinct follow-up of single light rays is possible for better understanding of patient reports.

Original languageEnglish (US)
Pages (from-to)S770
JournalInvestigative Ophthalmology and Visual Science
Issue number3
StatePublished - Feb 15 1996

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience


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