COMPARISON OF IOL CALCULATION RESULTS BASED ON REFRACTION-BASED FORMULAS AND ULTRASOUND BIOMETRY

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JABARVAND M.; MERAREFEYAN S.A.; MIRSHAFIEI A.; VELAEI N.; DAVABEI T.

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Journal: JOURNAL OF CURRENT OPHTHALMOLOGY Year:2000 | Volume:12 | Issue:1-2 Page(s): 27-32

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Title

COMPARISON OF IOL CALCULATION RESULTS BASED ON REFRACTION-BASED FORMULAS AND ULTRASOUND BIOMETRY

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Keywords

IOL POWER CALCULATIONQ3

REFRACTIVE ERRORQ3

KERATOMETRYQ3

Abstract

Purpose: Considering the popularity of cataract surgery throughout the country and lack of ultrasound biometry facilities in some regions, this study was designed to compare results of IOL POWER CALCULATIONs by refraction- based formulas with those obtained by ultrasonographic biometry as the gold standard.Patients & Methods: This is a diagnostic clinical trial performed at Farabi Eye Hospital on 100 eyes in 50 cases in whom refraction was feasible during 1999. Each patient underwent refraction, and ultrasound biometry.Thereafter IOL calculations were done based on the SRK II formula and the two following refraction-based formulas and finally compared.Formula I: PC IOL Power =20+45-MK-------------3+SE-----------3+2 (11.5-VID)MK=Mean KERATOMETRY SE = Spherical EquivalentVID= Visible Iris DiameterFormula II:PC IOL= 18±1.6 ( SE) PowerResults: Mean difference between figures obtained by formula I and biometry was 1.30±0.90. Corresponding figure for formula II was 3.55±1.10 In emmetropic cases (with in ±0.5) of true emmetropia), average PC IOL calculation based on biometry was 21.20 D. Conclusion: Formula I yields better IOL calculations than formula II when compared with ultrasound biometry provided that the refractive status of the eye prior to cataract surgery is known.

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APA: Copy

JABARVAND, M., MERAREFEYAN, S.A., MIRSHAFIEI, A., VELAEI, N., & DAVABEI, T.. (2000). COMPARISON OF IOL CALCULATION RESULTS BASED ON REFRACTION-BASED FORMULAS AND ULTRASOUND BIOMETRY. JOURNAL OF CURRENT OPHTHALMOLOGY, 12(1-2), 27-32. SID. https://sid.ir/paper/53185/en

Vancouver: Copy

JABARVAND M., MERAREFEYAN S.A., MIRSHAFIEI A., VELAEI N., DAVABEI T.. COMPARISON OF IOL CALCULATION RESULTS BASED ON REFRACTION-BASED FORMULAS AND ULTRASOUND BIOMETRY. JOURNAL OF CURRENT OPHTHALMOLOGY[Internet]. 2000;12(1-2):27-32. Available from: https://sid.ir/paper/53185/en

IEEE: Copy

M. JABARVAND, S.A. MERAREFEYAN, A. MIRSHAFIEI, N. VELAEI, and T. DAVABEI, “COMPARISON OF IOL CALCULATION RESULTS BASED ON REFRACTION-BASED FORMULAS AND ULTRASOUND BIOMETRY,” JOURNAL OF CURRENT OPHTHALMOLOGY, vol. 12, no. 1-2, pp. 27–32, 2000, [Online]. Available: https://sid.ir/paper/53185/en

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