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Comparison of intraocular lens power calculation formulas in children undergoing cataract surgery

Poster Details

First Author: A.Yaman TURKEY

Co Author(s):    H. Doruk   D. Er   T. Öztürk   T. Berk     

Abstract Details



Purpose:

To evaluate accuracy of commonly used intraocular lens power calculation formulas (SRKII, SRK/T, HofferQ, Holladay) in pediatric eyes with developmental cataract.

Setting:

Department of Ophthalmology, Dokuz Eylul University Hospital, ?zmir/Turkey

Methods:

46 eyes of 30 patients, older than 2 years at surgery, who had developmental cataract and previosly undergone cataract surgery with intraocular lens implantation were included in this study. The parameters like axial length and keratometry were employed in 4 common intraocular lens power calculation formulas to determine the post operative refractive predictive outcomes. At the 3-months post operatively visit, refractive results were obtained with retinoscopy and spherical equivalent values were calculated. The absolute prediction errors of the formulas were evaluated seperately according to keratometry, patient age and axial length values.

Results:

The mean age at surgery was 5.23 years(2-15 years). The mean keratometry was 44.23 diopters(40.06D-49.2D). The mean axial length was 21.33mm (19.81-23.67mm). The mean absolute prediction error was 0,91D for SRKII, 0.73D for SRK/T, 0.75D for Holladay and 0.78D for HofferQ. The difference between formulas was not statistically significant. In the eyes with axial length smaller than 21 mm Hoffer Q and Holladay formulas performed better than the others. (HofferQ:0.79D, Holladay:0.82D, SRK/T:1,02D, SRKII:1,33D) In the smaller age group(<5 years) we did not find significant difference among the formulas.(HofferQ:0.89D, Holladay:0.91D SRK/T:0.92D SRKII:0.94D) In the steeper corneas Holladay and SRK/T succeeded a little more than the other formulas.(Holladay:0.66D, SRK/T:0.69D, HofferQ:0.74D, SRKII:0.87D).

Conclusions:

None of the formulas which we evaluated for IOL power calculation did significantly perform better than the other formulas in pediatric eyes except the second generation formula SRKII, which has a little poorer predictive outcomes. The selection of the IOL power calculation formula in pediatric eyes is still a controversial issue. Lastly, if we consider the factors like axial length, keratometry and patient age we can reach better outcomes. Financial Disclosure:No

Financial Disclosure:

NONE

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