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

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Abstract

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 7.09mm for anterior and posterior surfaces, respectively. Crystalline lens tilt ranged from 2.8 to 2.87deg horizontally and from 2.58 to 1deg vertically. Crystalline lens decentration ranged from 0.09 to 0.45 mm horizontally and from 0.09 to 0.22mm vertically. IOL tilt ranged from 3.6 to 1.51deg horizontally and from 5.97 to 1.85deg vertically. IOL decentration ranged from 0.53 to 0.31mm horizontally and from 0.13 to 0.96mm vertically.

© 2006 Optical Society of America

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