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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 1, Iss. 4 — Apr. 12, 2006

Phakometry and lens tilt and decentration using a custom-developed Purkinje imaging apparatus: validation and measurements

Patricia Rosales and Susana Marcos  »View Author Affiliations

JOSA A, Vol. 23, Issue 3, pp. 509-520 (2006)

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We present a Purkinje imaging system for phakometry and measurement of tilt and decentration of crystalline and intraocular lenses (IOLs). Crystalline lens radii of curvature were estimated by using both a merit function and the equivalent mirror approaches. Tilts and decentrations were estimated by using Phillips’s linear analysis. We present a complete validation of the technique through exhaustive computer simulations and control experiments, and measurements in 17 normal eyes (mean age 26.67 ± 2.31 ) and nine postcataract surgery eyes (mean age 74 ± 2.3 ). Crystalline lens radii ranged from 12.7 to 8.81 mm and from 5.64 to 7.09 mm for anterior and posterior surfaces, respectively. Crystalline lens tilt ranged from 2.8 to 2.87 deg horizontally and from 2.58 to 1 deg vertically. Crystalline lens decentration ranged from 0.09 to 0.45 mm horizontally and from 0.09 to 0.22 mm vertically. IOL tilt ranged from 3.6 to 1.51 deg horizontally and from 5.97 to 1.85 deg vertically. IOL decentration ranged from 0.53 to 0.31 mm horizontally and from 0.13 to 0.96 mm vertically.

© 2006 Optical Society of America

OCIS Codes
(330.4300) Vision, color, and visual optics : Vision system - noninvasive assessment
(330.5370) Vision, color, and visual optics : Physiological optics

ToC Category:
Vision, Color, and Visual Optics

Original Manuscript: April 22, 2005
Revised Manuscript: July 27, 2005
Manuscript Accepted: August 2, 2005

Virtual Issues
Vol. 1, Iss. 4 Virtual Journal for Biomedical Optics

Patricia Rosales and Susana Marcos, "Phakometry and lens tilt and decentration using a custom-developed Purkinje imaging apparatus: validation and measurements," J. Opt. Soc. Am. A 23, 509-520 (2006)

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