A new parameter for predicting postoperative intraocular lens position: crystalline lens equator depth

Session Details

Session Title: IOL Power Calculations

Session Date/Time: Sunday 11/09/2016 | 16:00-18:00

Paper Time: 16:24

Venue: Hall C2

First Author: : K.Hwang SOUTH KOREA

Co Author(s): :    C. Jeon                    

Abstract Details

Purpose:

To test the hypothesis that the preoperative crystalline lens equator depth (pre-CLED) reliably predicts the postoperative position of the intraocular lens (IOL)

Setting:

Retrospective study, Seoul St. Mary`s hospital, Seoul, Korea.

Methods:

Lens mages were obtained using 3-D OCT in a femtosecond laser machine for cataract surgery and the pre-CLED was defined as the distance from the central back surface of the cornea to the equatorial plane of the crystalline lens. The postoperative anterior chamber depth (post-ACD) was measured using a Scheimpflug camera at 2 months after surgery and analyzed using multiple linear regression for covariance, with variables that were determined before surgery; namely, the pre-CLED, lens thickness, lens vaulting measured using OCT, preoperative ACD (pre-ACD) – measured using OCT, optical biometry, corneal topography, and the Scheimpflug camera

Results:

The mean pre-CLED, lens thickness, and lens vaulting were 4.11±0.34 mm, 4.26±0.46 mm, and 1.44±0.27 mm, respectively. The post-ACD was 4.59±0.42 mm. Single regression analysis showed that the post-ACD was significantly correlated with the pre-CLED (R2 = 0.437; P < 0.001), the pre-ACD measured using the Scheimpflug camera (R2 = 0.349; P < 0.001). Using a new regression formula containing significant variables only, the post-ACD can be predicted with an accuracy of 43.7%.

Conclusions:

The preoperative crystalline lens equator depth may be a reliable predictor of the postoperative IOL position. This knowledge may help improve the refractive outcomes of cataract surgery

Financial Disclosure:

NONE