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Intraocular lens power calculation methods for eyes that have undergone LASIK.: comparison between Orbscan and Pentacam readings

Poster Details

First Author: N.Kopsachilis UK

Co Author(s):    D. Parmar              

Abstract Details


To report refractive outcomes following phacoemulsification (PE) and posterior chamber intraocular lens (PCIOL) implantation in eyes with previous corneal refractive surgery.


Whipps Cross University Hospital, Barts Health NHS Trust


In this retrospective case series, 21 eyes of 18 patients with previous keratorefractive surgery for myopia laser in situ keratomileusis underwent PE+PCIOL. The Orbscan II scanning slit topography was employed to determine the flattest keratometric reading within the 3-mm central zone and the Pentacam was used to determine the estimated K-readings within the 3 mm zone. This measurement was used as the generic mean value utilized for the IOL calculator online software Version 4.6, ASCRS foundation) to calculate IOL power


Mean age and follow-up period were 55±3.5 years. Mean implanted lens power was 18.5±4.25 D There was no significant difference between mean target refraction (-0.75±0.5D) and achieved postoperative spherical equivalent refractive error (-0.55±0.75) at final follow-up (P=0.05). The achieved spherical equivalent refractive error was within ±0.50 D of intended refraction in 80 % of the eyes.


We found the use of Orbscan and Pentacam K values to be equally useful in the calculation of IOL power in eyes with previous corneal refractive surgery with the help of the IOL calculator software.

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