Posters

Intraoperative wavefront aberrometry in post-radial-keratotomy cataract patients.

Poster Details

First Author: C.Dhull INDIA

Co Author(s):    S. Khokhar   Y. Gupta   S. Gaur              

Abstract Details

Purpose:

To compare the accuracy of intraoperative wavefront aberrometry (IWA) with current intraocular lens (IOL) power formulas in post-radial keratotomy (post RK) cataract patients.

Setting:

Dr Rajendra Prasad Centre for Ophthalmic Science, All India Institute of Medical Science, New Delhi

Methods:

It was a prospective case series of 30 eyes of 18 patients who underwent cataract surgery from July 2017 to December 2018. All patients had a prior history of radial keratotomy and cataract upto nuclear sclerosis grade 2. The IOL power was calculated using the SRK/T, Holladay 1 formula and double K method (conventional method) using preoperative biometry. IWA was performed using Optiwave Refractive Analysis (ORA) wavefront aberrometer system (WaveTec Vision System, Inc). IOL implanted was chosen with combined method. IOL back-calculation for emmetropia was done using previously published formulas.

Results:

Amongst 30 eyes of 18 patients, 18 had RK with standard 8 incisions(Group 1) and 12 had >8 incisions(Group 2). Mean postoperative uncorrected visual acuity was 20/40. Mean postoperative spherical equivalent was 0.15D(-1.5 to +2.75D). The actual IOL implanted, ORA prediction, and conventional method were within 0.5D of emmetropia in 43.3%,40%, 33% of eyes and within 1D in 80%, 76.6% and 66% respectively. In subgroup analysis, group 1 patients were within 1D of emmetropia in 83%,77.7% and 83.3% and group 2 were 66%,75% and 41.6% respectively. The ORA’s ability to predict IOL power was significantly better in group 2(p=0.031).

Conclusions:

Combined use of the ORA and conventional method to predict IOL power allows cataract surgeons to achieve better refractive outcomes than the use of any one method alone. The ORA’s ability to predict IOL power in post RK patients with >8 incisions is better than conventional methods.

Financial Disclosure:

None