Posters

Six month outcomes of femtosecond-assisted wavefront-guided LASIK with a new generation aberrometer

Poster Details

First Author: G.Prakash UNITED ARAB EMIRATES

Co Author(s):    D. Srivastava   M. Suhail   V. Jhanji   J. Chacko Reji     

Abstract Details

Purpose:

Wavefront guided lasik has evolved and become more predictable in the recent past. We evaluate the outcomes of wavefront guided lasik with the data capture based on a new hartmann shack type aberrometer .

Setting:

Cornea and Refractive Surgery services of a tertiary care multispeciality hospital

Methods:

In this non comparative ,consecutive clinical case study , 40 eyes of 20 candidates with myopia/astigmatism without any contraindications to lasik or history of previous surgery recruited. Aberrometry was done on iDesign Advanced WaveScan aberrometer; Abbott Medical Optics(AMO), Inc., CA ). All patient underwent a femtosecond assisted flap creation (Intralase iFIS 150 Khz, AMO) followed by excimer on Visx Star4(AMO Inc).The outcomes measures were UDVA, CDVA, residual sphere , astigmatism and SEQ , performed at 1,3, and 6 months. Safety , efficacy and refractive surgery standardized graphs were computed.

Results:

The Sphere, Cylinder and SEQ were -4.025±1.5DSph, -0.7±0.DCyl and -4.39±1.6D respectively preoperatively and 0.04±0.13DSph,-0.10±0.13DCyl and -0.1±0.13D respectively at 6month (p<0.001,Wilcoxon's Signed Rank Test(WSRT) for all comparisons). The postoperative CDVA (-0.08±0.08) and UDVA (-0.04±0.09) were better than the preoperative CDVA (0.05±0.09) (p<0.01, WSRT for both comparisons). A total of 37/40 (92.5%) achieved a UDVA of ≥20/20 and 100% ≥20/25 compared to a preoperative CDVA of ≥20/20 in 60% and 100% ≥20/32.The regression plot for achieved (Ach) vs intended (Int) correction at 6 months was Ach = 0.0987x Int - 0.49, R-squared =0.99, p <0.001) . The SEQ stablised between 3 and 6 months followup (p=0.6).There were no cases of loss of CDVA.

Conclusions:

The outcomes of wavefront guided lasik assisted by this new aberometer are safe and effective over 6 months in this intital , small sample size study. FINANCIAL INTEREST: NONE