Effect of pupil size on biometry measurements using the IOLMaster

Galia Adler*, Jonathan Shahar, Rivka Kesner, Eldar Rosenfeld, Naomi Fischer, Anat Loewenstein, Shimon Kurtz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose To evaluate the effect of pupil dilation on biometric measurements and intraocular lens power calculation using the IOLMaster (Carl Zeiss Meditec). Design Prospective, observational case series. Methods In this prospective study, 2 consecutive optical biometry measurements, before and after pupil dilation, were obtained using the IOLMaster on 318 eyes of 214 patients at the cataract presurgery clinic. The parameters compared were axial length, corneal power, cylinder, and the corresponding intraocular lens power, which was calculated using the Sanders-Retzlaff-Kraff/Theoretical formula. Results This study found no statistically significant difference before and after dilation in axial length (0.005 mm; P =.476), corneal power (0.001 diopters [D]; P =.933), or calculated intraocular lens power (0.011 D; P =.609). A statistically significant difference was shown in cylinder measurements before and after dilation (0.102 D; P <.001). Conclusions This study demonstrated there is no clinically significant effect of pupil dilation on the IOLMaster measurements of axial length, corneal power, and corresponding theoretical intraocular lens power calculated using the Sanders-Retzlaff-Kraff/Theoretical formula.

Original languageEnglish
Article number9221
Pages (from-to)940-944
Number of pages5
JournalAmerican Journal of Ophthalmology
Volume159
Issue number5
DOIs
StatePublished - 1 May 2015
Externally publishedYes

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