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

V. Fernandez, Fabrice Manns, S. Zipper, S. Sandadi, M. Hamaoui, H. Tahi, A. Ho, Jean-Marie A Parel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

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)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsF. Manns, P.G. Soderberg, A. Ho
Pages113-118
Number of pages6
Volume4245
DOIs
StatePublished - 2001
EventOphthalmic Technologies XI - San Jose, CA, United States
Duration: Jan 20 2001Jan 21 2001

Other

OtherOphthalmic Technologies XI
CountryUnited States
CitySan Jose, CA
Period1/20/011/21/01

Fingerprint

Topography
Lenses
topography
asphericity
lenses
curvature
radii
cornea
refilling
Crystalline materials
globes
equators
files
Acrylics
apexes
rings
polymers
Polymers

Keywords

  • Accommodation
  • Asphericity
  • Crystalline lens
  • Shape
  • Topography

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Fernandez, V., Manns, F., Zipper, S., Sandadi, S., Hamaoui, M., Tahi, H., ... Parel, J-M. A. (2001). Measurement of the topography of human cadaver lenses using the PAR corneal topography system. In F. Manns, P. G. Soderberg, & A. Ho (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 4245, pp. 113-118) https://doi.org/10.1117/12.429262

Measurement of the topography of human cadaver lenses using the PAR corneal topography system. / Fernandez, V.; Manns, Fabrice; Zipper, S.; Sandadi, S.; Hamaoui, M.; Tahi, H.; Ho, A.; Parel, Jean-Marie A.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / F. Manns; P.G. Soderberg; A. Ho. Vol. 4245 2001. p. 113-118.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Fernandez, V, Manns, F, Zipper, S, Sandadi, S, Hamaoui, M, Tahi, H, Ho, A & Parel, J-MA 2001, Measurement of the topography of human cadaver lenses using the PAR corneal topography system. in F Manns, PG Soderberg & A Ho (eds), Proceedings of SPIE - The International Society for Optical Engineering. vol. 4245, pp. 113-118, Ophthalmic Technologies XI, San Jose, CA, United States, 1/20/01. https://doi.org/10.1117/12.429262
Fernandez V, Manns F, Zipper S, Sandadi S, Hamaoui M, Tahi H et al. Measurement of the topography of human cadaver lenses using the PAR corneal topography system. In Manns F, Soderberg PG, Ho A, editors, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4245. 2001. p. 113-118 https://doi.org/10.1117/12.429262
Fernandez, V. ; Manns, Fabrice ; Zipper, S. ; Sandadi, S. ; Hamaoui, M. ; Tahi, H. ; Ho, A. ; Parel, Jean-Marie A. / Measurement of the topography of human cadaver lenses using the PAR corneal topography system. Proceedings of SPIE - The International Society for Optical Engineering. editor / F. Manns ; P.G. Soderberg ; A. Ho. Vol. 4245 2001. pp. 113-118
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