Repeatability of corneal astigmatism measurements

Session Details

Session Title: Special Cases II

Session Date/Time: Monday 07/09/2015 | 17:00-18:30

Paper Time: 17:06

Venue: Room 11

First Author: : A.Belkin ISRAEL

Co Author(s): :    A. Abulafia   A. Levy   A. Ohayon   D. Koch   L. Wang   E. Assia     

Abstract Details

Purpose:

To compare the repeatability of the astigmatism measurements taken by various devices.

Setting:

Ein-Tal Eye Center, Tel Aviv, Israel

Methods:

We performed two sets of corneal measurements on 28 right eyes of 28 healthy volunteers at an interval of five to ten days. All exams were done by a single experienced optometrist, and all measurements adhered to strict validation criteria. Inclusion criteria were age ≥ 18 years, no known ocular pathology, no contact lens wear, and no previous ocular surgery. Corneal measurements were performed using IOLMaster 500, Lenstar LS 900, NIDEK ARK-530A, Atlas topographer and Pentacam HR. Repeatability was evaluated by comparing the differences between the two measurements for the J0 and J45 vectors.

Results:

The lowest variances of the differences in measurements (J0 and J45) were seen with the Lenstar and the Pentacam, P=0.026. Using the Lenstar 78.6% of eyes had an absolute power difference of the measured corneal astigmatism which was smaller or equal to 0.25 Diopter, followed by the Pentacam (71.4%), the Nidek (60.7%), the IOLMaster (42.9%) and the Atlas (35.7%) devices.

Conclusions:

The repeatability of corneal astigmatism measurements can vary among different devices. The implications of these findings should be considered for surgical planning and monitoring postoperative astigmatic outcomes.

Financial Interest:

NONE