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Pentacam vs IOLMaster: comparison of keratometry readings in cataract surgery candidates

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Session Details

Session Title: Imaging Anterior Segment

Session Date/Time: Monday 07/09/2015 | 14:30-16:30

Paper Time: 14:36

Venue: Room 11

First Author: : A.Abreu PORTUGAL

Co Author(s): :    T. Borges   J. Coelho   M. Lume   M. Meneres   P. Meneres        

Abstract Details


Accurate measurement of corneal refractive power is important not only for diagnosis but also for proper surgery planning and to achieve predictable postsurgical refractive results. The purpose of this study is to compare and evaluate the agreement between keratometry readings using two different devices: the Oculus Pentacam® HR and IOL Master® 500.


Terciary Referral Centre in Porto, Portugal - Centro Hospitalar do Porto


In this non-randomized, retrospective study, we analysed the clinical records of 170 eyes of 119 patients scheduled to have cataract surgery between May and August of 2014. Different corneal parameters (keratometry, corneal power and corneal astigmatism) were measured by Oculus Pentacam® HR and IOL Master® 500. Fifty-nine eyes were excluded due to unsatisfactory results in Pentacam's Examination Quality Specification. Data of 111 eyes were carefully analysed.


We evaluated 111 eyes of 85 patients (40% males; 60% females). Mean age of patients was 72.28 ± 9.46 years old. Mean corneal power measured by Zeiss IOL Master® 500 and Oculus Pentacam ® HR was 44.19 ± 1.47 D and 44.10 ± 1.39 D, and mean astigmatism was 1.12 ± 0.81 D and 0.98 ± 0.71 D, respectively. There were no statistically significant differences between mean corneal power and values of flat and steep keratometry (p >0.05). There were statistically significant differences between mean corneal astigmatism measured by the two devices (p 0.01). Nevertheless, measurements between the devices were well correlated.


Oculus Pentacam® HR and IOL Master® 500 are useful devices to evaluate keratometry. In our study, although there were no statistically significant differences between mean corneal power, flat and steep keratometry, we found a difference between corneal astigmatism measurements. The measurements between the devices agreed and were well correlated. Information acquired by more than one device can be very useful when planning astigmatism treatment.

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