The accuracy of various formulas for IOL power calculation in infants with congenital cataract

Session Details

Session Title: Paediatric Ophthalmology & Other Topics

Session Date/Time: Tuesday 25/09/2018 | 08:00-10:30

Paper Time: 08:30

Venue: Room A3, Podium 2

First Author: : I.Zaidullin RUSSIA

Co Author(s): :    M. Bikbov                    

Abstract Details

Purpose:

The purpose of this study is to evaluate the accuracy of various formulas for IOL power calculation in infants with cataract

Setting:

Ufa Eye Research Institute, Russia

Methods:

83 operations were performed on infants with congenital cataract aged 5 to 37 weeks. The average age at surgery was 19.33 ± 11.51 weeks. The IOL was calculated for hypocorrection depending on age. A hypocorrection from +12 diopters (D) to +8.0 D was included. The following formulas were used: SRK / T, Hoffer Q, Haigis, Holladay 1, SRK II, Binkhorst. Surgical Technique: manual capsulorhexis through corneal incisions, lens aspiration with intracapsular implantation of the IOL followed by transciliary 25 G posterior capsulectomy with anterior vitrectomy were performed. Postoperative refraction was determined 5-7 days after the surgery under cycloplegia.

Results:

Prediction error = calculated - actual refraction. The refraction error is highest in children operated up to 10 weeks of age. Using the Holladay 1formula the error is 2.31 ± 1.8 D, using SRK / T it is 2.34 ± 1.5 D. The lowest refraction error was obtained using the formulas SRK / T (1, 34 ± 1,0 D) and Binkhorst (1,44 ± 1,15 D) in children operated within 11 to 37 weeks of age. The highest error resulted from the use of the Holladay 1 formula(2,66 ± 1,66 D) and Haigis, SRK II.

Conclusions:

The highest refraction errors were measured in children operated up to 10 weeks. Calculation by the Holladay 1 and SRK / T formula is preferable at this age. At an age older than 11 weeks the lowest refraction error is obtained using the SRK / T and Binkhorst formulas.

Financial Disclosure:

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