Posters

What can you expect from intraoperative aberrometry on pseudophakic eyes?

Poster Details

First Author: A. Cantagalli ITALY

Co Author(s):                        

Abstract Details

Purpose:

To investigate the abilities of intra-operative aberrometry as a final refraction check in cataract surgery.

Setting:

Private Hospital, GSD Villa Erbosa, Bologna, Italy

Methods:

In this study, the pseudo-phakic refraction of 50 eyes is measured using the intra-operative aberrometer I-O-W-A (Eyesight & Vision, Germany). The intra-operative refraction is compared with the refraction in follow-up examinations (Tracey Technologies). A special situation arises when the IOL doesn't unfold its final refraction within the first minutes after implantation. To investigate the influence of the unfolding state on the intra-operative refraction, I-O-W-A measures the refraction twice: the first sampling point is directly after implantation of the IOL, the second one a few minutes later.

Results:

For 50 eyes, the wavefront measured with I-O-W-A is compared with results of follow-up examinations. A preliminary dataset of 17 eyes yields a mean difference of 0.19 D (standard deviation: 0.36 D). The effect of a slowly unfolding IOL is investigated in form of a case study. It is found that folding the IOL in the injector may cause a significant cylinder which is seen directly after implantation. The induced cylinder decreases within a few minutes and vanishes until the follow-up examination. Furthermore, the induced cylinder affects only weakly the intra-operative spherical equivalent.

Conclusions:

Intra-operative aberrometry on pseudo-phakic eyes is a helpful tool for final refraction checks in cataract surgery. However, when implanting slowly unfolding IOLs, there might be a significant cylinder directly after implantation. There are two ways to deal with such a situation: Either restricting yourself to the spherical equivalent, or waiting a few minutes until the IOL has sufficiently unfolded, such that the IOL's refraction is close to its final value.

Financial Disclosure:

NONE