This Article Full Text Full Text (PDF) Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Services Email this link to a friend Similar articles in this journal Similar articles in PubMed Add article to my folders Download to citation manager Request Permissions Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Elder, M J Search for Related Content PubMed PubMed Citation Articles by Elder, M J

Predicting the refractive outcome after cataract surgery: the comparison of different IOLs and SRK-II v SRK-T

Department of Ophthalmology, Christchurch School of Medicine, University of Otago

Correspondence to:
Correspondence to:
Associate Professor Mark Elder, Department of Ophthalmology, Christchurch Hospital, PO Box 4710, Christchurch, New Zealand

ABSTRACT
Aim: To determine any differences between the predictive abilities of the IOL calculation formulas of SRK-II and SRK-T and to compare these using two different IOL types.

Methods: A prospective, consecutive, single surgeon clinical trial was conducted on 400 consecutive patients who received routine, standardised phacoemulsification cataract surgery. 200 had cataract surgery and had the Alcon MZ30BD, a 5.5 mm one piece PMMA IOL, and another 200 cases used the Chiron C11UB, a silicone plate haptic IOL. The data used optimised A-constants. The measures were preoperative axial length and keratometry, IOL implanted, and refractive error at 4–6 weeks postoperatively.

Results: There was no significant difference between the predictive abilities of SRK-II or SRK-T. For the Alcon and Chiron lens respectively, prediction errors using SRK-II were <0.5 dioptres in 58% and 70% and for <1.0 dioptres in 84% and 92%. These differences were statistically significant (², p=0.02).

Conclusion: There are differences in the predictability of refractive outcomes between intraocular lens styles.

Keywords: refractive outcome; cataract surgery

This article has been cited by other articles:

				J. R. Lewis, A. E. Knellinger, A. M. Mahmoud, and T. F. Mauger Effect of Soft Contact Lenses on Optical Measurements of Axial Length and Keratometry for Biometry in Eyes with Corneal Irregularities Invest. Ophthalmol. Vis. Sci., August 1, 2008; 49(8): 3371 - 3378. [Abstract] [Full Text] [PDF]