Journal of the Korean Ophthalmological Society 1999;40(8):2145-2151.
Published online August 1, 1999.
Accuracy of Intraocular Lens Power in Cataract Patients Underwent Excimer Laser PRK.
Hyung Jin Doh, Woo Jin Sah, Yoon Won Myoung, Tae Won Hahn, Jae Ho Kim
Department of Ophthalmology, Kangnam St.Mary's Hospital, The Catholic University Medical College, Seoul, Korea.
엑시머레이저 근시교정술을 받은 환자에서 백내장수술시 인공수정체 돗수측정의 정확도
도형진(Hyung Jin Doh),사우진(Woo Jin Sah),명윤원(Yoon Won Myong),한태원(Tae Won Hahn),김재호(Jae Ho Kim)
Abstract
We retrospectively evaluated postoperative refraction of four patients(five eyes)who received intraocular lens implantation after excimer laser photorefractive keratectomy (PRK).The mean age of the patients was 44.8 years and 3 patients were female and 1 patient was male.The mean interval between PRK and cataract operation was 20.2 months (1 to 45 months)and the mean follow-up time after cataract operation was 16.2 months(2~43months).Phacoemulsification and PMMA-PCL(6.0~6.5 mm)implantation were made in all cases.SRK-II formula,the most popular empirical formula was used in first 3 cases(group I),but Idem-lens formula,a primitive theoretical formula was used in another 2 cases (group II)after occurrence postoperative refraction errors in group I .In group I and II,the mean postoperative refraction error was +3.00 diopters and +0.50 diopters and uncorrected visual acuity at postoperative 2 months was 20/60 and 20/24 respectively.The mean of calculated IOL-power was -3.75 diopter in group I and -0.625 diopter in group II.From these results,the empirical formula is definitely unsuitable for the calculation of IOL power in the cataract operation following excimer laser PRK. Moreover,although a primitive one,Idem-lens theory could be temporally useful for the IOL-power calculation in such cases.In conclusion,new formula is required for the cataract operation following excimer laser PRK.
Key Words: Excimer laser photorefractive keratectomy;Empirical formula;Theoretical formula;SRK-II formula;Idem-lens theory


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