Posters

Usefulness of measuring CCT intraoperatively in LASIK using handheld ultrasound pachymeter

Poster Details

First Author: J.Sarwate INDIA

Co Author(s):    N. Sarwate   R. Sarwate                 

Abstract Details

Purpose:

To study the utility of intraoperative handheld ultrasound pachymetry in LASIK.

Setting:

Sarwate Eye Clinic & Laser Centre, Satara, India - A Tertiary eye care centre.

Methods:

Retrospective analysis of 1000 eyes in age group of 19 to 35 yrs with moderate to high myopia with or without astigmatism & CCT>500 µm which underwent LASIK by a single surgeon from 2010-2012 with Wavelight Allegretto Excimer Laser & Moria M2 Microkeratome. CCT measurements were done by single operator using Tomey TMS-2 ultrasound pachymeter- 1)preop 2)intraop after creating the flap (before lifting) 3) after lifting the flap (before laser delivery) 4) after laser ablation. Flap thickness was calculated as difference between 1 & 2 and residual stromal bed was calculated as difference between 3 & 4.

Results:

The mean pachymetry was 520 ± 25.3 µm (Range 500 to 550 µm) with mean SE of -7.5 ± 2.5 D. None of the eyes needed intraoperative alteration of the planned ablation parameters & cut off of >300 µm residual stromal bed was maintained in all cases. There was no incidence DLK postoperative in all the eyes.

Conclusions:

Intraoperative ultrasound pachymetry is reliable method to maintain the safe residual stromal bed thickness >300 µm & reduce the risk of keratectasia.

Financial Disclosure:

NONE