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Intra-device repeatability of corneal power and astigmatism measurements

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Session Details

Session Title: Cataract Surgery Equipment/Instrumentation/Surgical Devices/OVDs

Session Date/Time: Tuesday 10/10/2017 | 16:00-17:00

Paper Time: 16:12

Venue: Room 4.1

First Author: : A.Rozenberg ISRAEL

Co Author(s): :    A. Einan-Lifshitz   L. Or   E. Pras   I. Avni   A. Adi        

Abstract Details


To compare intra-device repeatability of keratometry measurements.


Assaf-Harofeh Medical Center, Zerifin, Israel.


One eye of 30 healthy volunteers was measured in random order with four devices designed to measure corneal biometry. A second measure was made five to ten days later. All exams were performed by a single experienced optometrist. Inclusion criteria were age ≥ 18 years, no known ocular pathology, no contact lens wear within one month of the first exam, and no previous ocular surgery. Corneal measurements were made using the IOLMaster® 700, the Lenstar LS900®, the Tomey OA-2000 and the Pentacam® HR. The latter provided anterior corneal keratometry and total corneal refractive power (TCRP).


More than 95% (142/150) of instances had ≤ 0.25D of mean keratometry difference between measures, with no statistically significant difference by device (p = 0.34). The number of eyes with a corneal astigmatism vector difference greater than 0.25D was not statistically significantly different by device (p = 0.24). The percentage of eyes with repeatable corneal astigmatism orientation within 10 degrees was higher for the Lenstar and TCRP measures than for the other devices (p = 0.016).


Measures of intra-device repeatability of keratometry from modern biometric devices vary, but differences appear nominal. The repeatability of mean keratometry and corneal astigmatism measurements should be considered in planning for cataract surgery.

Financial Disclosure:

receives consulting fees, retainer, or contract payments from a competing company

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