Posters

Comparison of two optical biometry devices

Poster Details

First Author: O. Reitblat ISRAEL

Co Author(s):    A. Levy   G. Kleinmann   E. Assia              

Abstract Details

Purpose:

To compare biometric measurements of a new optical device, the OA-2000 (Tomey), with the standard biometer, the IOLMaster 500 (Zeiss), and its influence on intraocular lens (IOL) selection using the conventional used formulas: SRK/T, Holladay-1 and Haigis.

Setting:

Ein Tal Eye Center, Tel Aviv, Israel.

Methods:

Consecutive patients, candidate for cataract extraction, with preoperative biometry using both IOLMaster and OA-2000 were reviewed. Preoperative measurements of each device were used for power calculation of the SN60WF IOL aiming for emmetropia using the SRK/T, Holladay-1 and Haigis formulas.

Results:

60-eyes (34-patients) were analyzed. Good correlation was found between IOLMaster and OA-2000 in axial-length(AL), anterior-chamber-depth(ACD) and average-keratometry(k) values(correlation-coefficients: 1.000, 0.891 and 0.966, respectively,P<0.001). Good agreement was seen between the two devices in AL and ACD measurements (mean difference of 0.01mm,P=0.001, agreement within 0.05mm in 90% of cases, and mean difference of 0.05mm,P=0.070, agreement within 0.25mm in 88% of cases, respectively). A statistically significant flatter k was measured by OA-2000(mean difference of 0.59D,P<0.001, agreement within 0.50D in 50% of cases). IOL selection was similar using the two devices in 75%, 72% and 70% for the SRK/T,Holladay-1 and Haigis formulas, respectively(inter-class-correlation 0.998,P<0.001).

Conclusions:

Overall, the OA-2000 provided measurements in high agreement with the values of the IOLMaster. However, a statistically significant trend was noted in average k readings that resulted in IOL selection differences in up to 30%. Analysis of final refractive errors is required to determine which of the two is more accurate.

Financial Disclosure:

NONE