Abstract
Intraocular lens power calculation in patients after keratorefractive surgery – personal experience
- Z Centrum Mikrochirurgii Oka „Laser” w Warszawie
- Z Kliniki Okulistyki Centrum Medycznego Kształcenia Podyplomowego Szpitala im. W. Orłowskiego w Warszawie
- Z Katedry i Kliniki Okulistyki II Wydziału Lekarskiego Akademii Medycznej w Warszawie
Purpose
To assess the efficacy of intraocular lens power calculation in patients with previous corneal refractive surgery.
Material and methods
Retrospective analysis of patients after laser refractive procedures, in whom cataract removal with phacoemulsification method was performed. Corneal power, which in conventional measurements after refractive surgery tends to increase value and results in postoperative hyperopic shift, were calculated with five methods, and the results were compared. To asses IOL power SRK/T formula was used.
Results
Mean spherical equivalent three months after procedures according to target refraction in examined patients ranged from –1.0D to+1.75 D. The difference between obtained and target refraction in 55% of patients ranged from -0.5D to +0.5D, and in 77% from -0.75D to +0.75D. Best results were obtained in calculations performed with Rossa method. The least effective appeared to be traditional IOL power calculation method without correcting factors.
Conclusions
In patients after laser correction of myopia, value of the measured keratometry should always be corrected. The most effective is Rosa method in combination with SRK/T calculation algorithm.
Keywords
intraocular lens power calculation, keratorefractive surgery, keratometry
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