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:: Volume 20, Issue 4 (Iranian Journal of Ophthalmology 2008) ::
2008, 20(4): 10-19 Back to browse issues page
Intraocular Lens Power Determination in 10 Patients with Previous Radial Keratotomy with or without Astigmatic Keratotomy: A Case Series
Seyed-Mohammad-Reza Taheri Dr. *, Azita Kheiltash Dr.
, mtaheri@noorvision.com
Abstract:   (14073 Views)

Purpose : To compare results of different methods for true corneal power determination and intraocular lens (IOL) power calculation formulas in 10 eyes of 7 patients with previous radial keratotomy (RK) with or without astigmatic keratotomy

Methods : In this case series study, we determined the corneal power of 10 eyes of 7 patients who had undergone RK with or without astigmatic keratotomy with two methods: the contact lens method (CLM) and the mean keratometry of the 3 mm zone in topography. In the next step, the IOL power for these eyes was calculated with the 3 formulas of SRK II, SRK T, and Holladay II the latter was used for the IOL selection. Refractive results were determined 3 month after surgery. According to the rule that 1.5 diopter (D) change in IOL power results in 1.0 D change in a patient’s refraction at the spectacle plane, we estimated the manifest refraction of these eyes with other formulas and compared them with the results achieved by Holladay II formula.

Results : Using the CLM and Holladay II formula, the postoperative manifest refraction spherical equivalent in 8 eyes ranged from -3.00 to +2.00 D. Both CLM and the mean keratometry of the 3 mm zone in topography lead to a greater degree of hyperopia after cataract surgery with SRK II formula than SRK T, and with SRK T than Holladay II. The mean spherical equivalent with mean keratometry of the 3 mm zone in topography and Holladay II formula was 0.08 D, and with CLM and Holladay II formula was -0.05 D.

Conclusion : In this study, it seemed that after RK, the mean keratometry of the 3 mm zone in topography gives a better estimate of true corneal power compared with CLM, and that the Holladay II formula brings results closer to emetropia compared with SRK II and SRK T formulas.

 

Iranian Journal of Ophthalmology 200820(4):10-19
Keywords: IOL Calculation, Intraocular Lenses, Holladay II, SRK T, SRK II, Cataract Surgery, Radial Keratotomy
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Type of Study: Original | Subject: General
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Taheri S, Kheiltash A. Intraocular Lens Power Determination in 10 Patients with Previous Radial Keratotomy with or without Astigmatic Keratotomy: A Case Series. Iranian Journal of Ophthalmology. 2008; 20 (4) :10-19
URL: http://irjo.org/article-1-186-en.html


Volume 20, Issue 4 (Iranian Journal of Ophthalmology 2008) Back to browse issues page
مجله چشم پزشکی ایران Iranian Journal of Ophthalmology
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