Articles: PDF OnlyMeasurement of intraocular lens decentration and tilt in vivoPhillips, Paul M.D.; Rosskothen, Heinz D.; Pérez-Emmanuelli, Juan M.D.; Koester, Charles J. Ph.D.*Author Information New York, New York *Reprint requests to Charles J. Koester, Ph.D., Columbia University, Department of Ophthalmology, 635 West 165th Street, New York, New York 10032. * Presented in part at the Symposium on Cataract, IOL and Refractive Surgery, Orlando, Florida, April 1987. The authors have a proprietary interest in the instrument described in this paper. Journal of Cataract and Refractive Surgery: March 1988 - Volume 14 - Issue 2 - p 129-135 doi: 10.1016/S0886-3350(88)80086-5 Free Metrics Abstract A method for measuring the tilt and decentration of intraocular lenses (IOLs) in the static eye using the Purkinje image locations is presented. The patient fixates on a target that is coaxial with the camera or is at a predetermined angle with the camera axis. A telecentric stop is introduced in the camera so the positions of the Purkinje images on the film are independent of their distance from the camera. Measurements of the image locations on the film are used with anterior chamber depth and corneal curvature measurement to calculate the tilt and decentration of the IOL. In a group of 14 randomly selected patients with posterior chamber IOLs, 13 gave Purkinje images that could be measured. The average tilt was 7.8 degrees and the average decentration was 0.7 mm. © Williams & Wilkins 1988. All Rights Reserved.