Posterior corneal data to improve refractive outcomes in cataract surgery

Session Details

Session Title: Paediatric Ophthalmology & Other Topics

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

Paper Time: 09:12

Venue: Room A3, Podium 2

First Author: : S.Srivannaboon THAILAND

Co Author(s): :    C. Chirapapaisan   N. Chirapapaisan                 

Abstract Details

Purpose:

to evaluate the refractive outcomes in cataract surgery using a combined anterior and posterior corneal data (True Keratometry: TK) for the IOL calculation and compare to conventional keratometric index data (Standard Keratometry: K)

Setting:

Department of Ophthalmology, Faculty of Medicine, Siriraj Hospital,Mahidol University, Bangkok, Thailand

Methods:

53 eyes of regular cataract patients were enrolled in this study.All eyes were measured biometric data using IOLMaster 700 (Carl Zeiss,Germany) including Standard Keratometry(K),True Keratometry(TK) which include posterior corneal data, Anterior Chamber Depth(ACD),Axial Length(AL),Lens Thickness(LT),and Central Corneal Thickness(CCT).The IOL power was calculate by 6 standard formulas (SRK/T,Haigis, HofferQ,Holladay1,Holladay2 and Barrett formula) using K and TK.All patients underwent uncomplicated phacoemulsification by single surgeon,single IOL (601P/PY,Carl Zeiss, Germany).The refractive outcomes were measured at 3 months.The Mean Absolute Error (MAEs),Median absolute error (MedAEs) was calculated and compared after adjusting systematic error of the mean.

Results:

The mean difference between K and TK was 0.04 D (K = 44.55±1.19/TK 44.59±1.20). The agreement between K and TK was high (R2 = 0.99). The mean difference between the IOL power derived by K and TK for all formulas were low (0.01-0.05 D). The optimized constants between using K and TK for the IOL power calculation were closed for all formulas. There was a trend toward lower MAEs and MedAEs for the using of TK when compare to K in all formulas.

Conclusions:

The K and TK can be used in all formulas using similar IOL constant. The preliminary results showed that adding posterior corneal data (using TK) might yielded better refractive outcomes in cataract surgery for all standard IOL formulas.

Financial Disclosure:

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