Measurement of the topography of human cadaver lenses using the PAR corneal topography system

V. Fernandez, F. Manns, S. Zipper, S. Sandadi, M. Hamaoui, H. Tahi, A. Ho, J. M. Parel

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Purpose: To measure the radius of curvature and asphericity of the anterior and posterior surfaces of crystalline lenses of human Eye-Bank eyes using the PAR Corneal Topography System (PAR-CTS). The measured values will be used in an optical model of the eye for lens refilling procedures. Methods: 6 flesh human Eye-Bank eyes were used. After excision of the cornea and iris the topography of the anterior surface of the crystalline lens was measured using the PAR-CTS. The sclera was then sectioned at the equator, the posterior segment was removed and the exposed posterior lens surface was measured. To avoid deformation of the globe a custom-made ring made of acrylic polymer was bonded onto the scleral surface facing the pars plana before the cornea was removed. The PAR-CTS files providing raw height along meridians separated by 5 degrees were exported for analysis. The meridians at 0, 45, 90 and 135 degrees were fitted with conic sections to obtain values of the apex radius of curvature (R) and asphericity (Q). Results: The average radius of curvature and asphericity were R=9.00+/-0.58 mm and Q=1.50+/-1.00 for the anterior surface and R=-5.89+/-0.45 mm and Q=-1.63+/-1.32 for the posterior surface. Conclusions: The measured values of the radii of curvature are in good agreement with values used in optical models of the relaxed eye. The asphericity constants of the lens surfaces are highly variable.

Original languageEnglish (US)
Pages (from-to)113-118
Number of pages6
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4245
DOIs
StatePublished - Jan 1 2001

Keywords

  • Accommodation
  • Asphericity
  • Crystalline lens
  • Shape
  • Topography

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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