4가지 각막곡률측정 시스템을 이용한 굴절교정수술 후 인공수정체도수계산법 비교

Comparison of Four Systems of IOL Calculation after Keratorefractive Surgery in Eyes Requiring Cataract Surgery

Purpose: To report the evaluation and comparison of true corneal power after corneal refractive surgery through ARK, Orbscan II<SUP>&reg;, Pentacam and IOL master. <br /> Methods: Target IOL (Intraocular lens) power calculated with the SRK/T formula using SMK (Sungmo Eye Hospital keratometry), which is a new method for measuring corneal refractive power, was compared with the back-calculated ideal IOL power after cataract surgery for 30 eyes that required cataract surgery and had previously undergone refractive surgery. Target IOL powers calculated using 4 systems were compared with IOL power calculated using the clinical history method for 64 eyes that had undergone refractive surgery. <br /> Results: Using SMK with the SRK/T formula, the actual refraction was within ±0.5 diopter (D) of the intended refraction for 63.8% of eyes and within ±1.0 D for 90.9% of eyes. Compared with target IOL power calculated with the clinical history method, target IOL power calculated by SMK with the SRK/T formula had a difference of 1.95 ± 0.86 D, which was similar to the results calculated by the Haigis-L formula and by TNP with Haigis. <br /> Conclusions: The difference in characteristics of intraocular lenses subtly affects the vision quality as measured by values such as MTF cut-off and Strehl ratio after cataract surgery. OQAS based on the double-pass technique is considered useful in more objective estimates of the real retinal image quality after cataract surgery which is difficult to explain simply by measuring visual acuity.<br /> J Korean Ophthalmol Soc 2013;54(12):1818-1823