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) |
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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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