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:: Volume 26, Issue 2 (Iranian Journal of Ophthalmology 2014) ::
2014, 26(2): 66-71 Back to browse issues page
Comparison of Refractive Outcomes of Different Intraocular Lens Power Calculation Formulas in Keratoconic Patients Undergoing Phacoemulsification
Mohammad Ali Zare Mehrjerdi Dr., Hassan Hashemi Dr., Farid Kalantari Dr., Mohammad Bagher Rajabi Dr. * , Mohammad Reza Fallah Tafti Dr.
, mb_rajabi@yahoo.com
Abstract:   (4347 Views)

 Purpose: In the present study we have tried to find the most reliable intraocular lens (IOL) power calculation formula in patients with keratoconus (KCN) and cataract.

 Methods: In a prospective case series between October 2010 and March 2012, eligible patients with cataract and KCN underwent phacoemulsification with IOL implantation. Preoperatively, based on IOL master keratometric data IOL power calculation was subsequently performed by means of six well-known formulas: Haigis, Holladay 1 and 2, Hoffer Q, SRKII, and SRKT. Postoperatively the “desired IOL power” was back-calculated in order to determine the most accurate formula for IOL power calculation.

 Results: Fourteen patients (20 eyes) with nuclear sclerosis and KCN were cumulatively enrolled. The mean age was 56.7 years±13.8 (SD) (range, 23 to 70 years). Nine patients (64%) were males. In mild KCN subgroup, SRK II and SRK-T represent as the “matched formulas” within defocus range of less than 1 D in 66.6% of cases. In moderate KCN subgroup, Hoffer Q, Holladay 1, Holladay 2, SRK II and SRK-T II represent as the “matched formulas” within defocus range of less than 1 D in 75% of cases. Finally in severe KCN subgroup, SRK II represents as the “matched formula” in 50% of cases.

 Conclusion: Findings of the present study suggest that irrespective of axial length classification, the SRK II formula can be considered as “the ideal formula” the one with the most reliable outcome in all stages of KCN.

  

 Iranian Journal of Ophthalmology 201426(2):66-71 © 2014 by the Iranian Society of Ophthalmology

Keywords: Keratoconus, Intraocular Lens Power Calculation Formula, Cataract Surgery
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Type of Study: Original | Subject: Anterior segment
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Zare Mehrjerdi M A, Hashemi H, Kalantari F, Rajabi M B, Fallah Tafti M R. Comparison of Refractive Outcomes of Different Intraocular Lens Power Calculation Formulas in Keratoconic Patients Undergoing Phacoemulsification. Iranian Journal of Ophthalmology. 2014; 26 (2) :66-71
URL: http://irjo.org/article-1-950-en.html


Volume 26, Issue 2 (Iranian Journal of Ophthalmology 2014) Back to browse issues page
مجله چشم پزشکی ایران Iranian Journal of Ophthalmology
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