Secondary IOL power calculation

Abstract In 40 aphakic eyes undergoing secondary IOL implantation, the axial length was calculated optically as well as measured by ultrasound, and the two methods of axial length determination were compared to evaluate the accuracy in the calculation of secondary IOL power. The mean refractive prediction error (± sd) was 0.18 diopters (± 0.96) and ‐0.37 diopters (± 0.83) using the optical and the biometric method, respectively. The difference in mean value was significant, whereas the variation around the mean value was not found to be significantly different between the two methods. A calculated axial length may offer a valuable alternative to biometry in the aphakic eye, increasing die accuracy of secondary IOL power calculation.

[1]  T. Olsen,et al.  Prediction of postoperative intraocular lens chamber depth , 1990, Journal of cataract and refractive surgery.

[2]  S D Klyce,et al.  Topographic changes in contact lens-induced corneal warpage. , 1990, Ophthalmology.

[3]  T. Olsen.  Calculating axial length in the aphakic and the pseudophakic eye , 1988, Journal of cataract and refractive surgery.

[4]  J. W. Lewis,et al.  A three‐part system for refining intraocular lens power calculations , 1988, Journal of cataract and refractive surgery.

[5]  T. Olsen.  Theoretical approach to intraocular lens calculation using Gaussian optics , 1987, Journal of cataract and refractive surgery.

[6]  T. Olsen.  Prediction of intraocular lens position after cataract extraction , 1986, Journal of cataract and refractive surgery.

[7]  D. Sanders,et al.  Comparison of the accuracy of the Binkhorst, Colenbrander, and SRK implant power prediction formulas. , 1981, Journal - American Intra-Ocular Implant Society.

[8]  R D Binkhorst,et al.  The accuracy of ultrasonic measurement of the axial length of the eye. , 1981, Ophthalmic surgery.