Posters

Postoperative intraocular lens position (pELP), tilt, and internal astigmatism with 3-dimensional swept-source optical coherence tomography (3D-OCT) in laser refractive cataract/lens surgery (LRCLS)

Poster Details

First Author: J.Ma CANADA

Co Author(s):                        

Abstract Details

Purpose:

To determine and predict post-op internal astigmatism from surgical post-op lens position and tilt changes w/ pre-op algorithm w/ tilt (A3D-t), vs post-op (pELP) and post-op tilt with a new post-op tilt algorithm (PA3D-t).

Setting:

University of Toronto

Methods:

Retrospective review of 218 cases (109 standard (S), 109 LRCLS (L)). A3D-t was compared to multivariate predictions (t1-ELP) w/ pre-op biometry vs pELP. Lens tilt (LT) estimations were also compared between our old algorithm vs PA3D-t.

Results:

Avg pELP: 4.71mm (SD:0.32), Avg A3D-t: 4.77 (SD:0.31), r=0.72 (p<0.01). Avg t1-ELP: 5.32 (SD:0.43), r=0.55 (p<0.01). Angle aggregated LT magnitude correlation coefficient between the old algorithm and PA3D-t for significant tilt was r=0.82(p<0.01). 78% of IOLs w/significant tilt w/ PA3D-t had tilt that resulted in against the rule induced astigmatism.

Conclusions:

A3D appears to be superior to theoretical estimates of pELP. 3D-OCT using refined algorithms can potentially result in more accurate post-operative refractive outcomes. Improved pseudophakic tilt prediction with PA3D-t may be able to better help predict post-op internal astigmatism.

Financial Disclosure:

receives consulting fees, retainer, or contract payments from a competing company