Posters

Repeatability and agreement of objective refraction and high order aberrations

Poster Details

First Author: G.Auffarth GERMANY

Co Author(s):    J. Usinger   I. Baur   J. Weindler   P. Poompokawat   R. Khoramnia        

Abstract Details

Purpose:

The purpose is to compare the objective refraction, provided from the Pentacam AXL Wave (P_AXL_W) (OCULUS Optikgeräte GmbH) and the ARK 1s (Nidek) and the ORK (Schwind) for phakic, pseudophakic and keratoconus eyes

Setting:

International Vision Correction Research Centre (IVCRC), Dept. of Ophthalmology, University Eye Clinic Heidelberg

Methods:

Prospective, randomized study with three consecutive measurements per eye with all three devices. Only measurements with a good quality of the respective parameter were included as provided by the device. Agreement was assessed with Mean +/- SD and Bland Altman, Repeatability was assessed with Coefficient of variation (CV)

Results:

Phakic eyes: P_AXL_W: n=34, mean abs. SEQ=0,99D, SD=0,08D, mean abs. CV=0,638; ARK 1s : n=34, mean abs. SEQ=1,07D, SD=0,08D, mean abs. CV=0,003; ORK: n=29, mean abs. SEQ=1,5D, SD=0,3D, mean abs. CV=3,29. Pseudophakic eyes: P_AXL_W: n=20, mean abs. SEQ=0,22D, SD=0,08D, mean abs. CV=0,552; ARK 1s : n=20, mean abs. SEQ=0,26D, SD=0,09D, mean abs. CV=0,71; ORK: n=16, mean abs. SEQ=1,3D, SD=0,26D, mean abs. CV=0,202. Keratoconic eyes: P_AXL_W: n=21, mean abs. SEQ=1,9D, SD=0,15D, mean abs. CV=0,25; ARK 1s : n=21, mean abs. SEQ=2,39D, SD=0,1D, mean abs. CV=0,534; ORK: n=20, mean abs. SEQ=2,2D, SD=0,34D, mean abs. CV=0,25

Conclusions:

The numbers of eyes are same for the ARK 1s and the P_AXL_W but for the ORK less eyes were available due to the lower success rate. The comparison of the SEQ provided by P_AXL_W and the ARK 1s showed no statistical differences for phakic and pseudophakic eyes. The ORK provides significant differences. For the keratoconic eyes, the P_AXL_W and the ARK 1s showed similar small repeatability. The comparison of the SEQ provided by the ORK and the P_AXL_W showed no statistical difference.

Financial Disclosure:

receives consulting fees, retainer, or contract payments from a competing company, travel has been funded, fully or partially, by a competing company