Ocular aberrations after wavefront optimized LASIK for myopia.
OBJECTIVE
To study the change in ocular aberrations after wavefront optimized (WFO) laser in situ keratomileusis (Lasik) for correction of myopia and to analyze causative factors that may influence them.


METHODS
This was a prospective case series. WFO Lasik was performed for the correction of myopia, using the hansatome (Bausch and Lomb) microkeratome to create the flap and the Allegretto laser (Wavelight Technologie) to perform the ablation. The Allegretto wave analyser (Tscherning-type) measured the ocular aberrations prior to Lasik , one month and six months postoperatively.


RESULTS
The mean age of the 59 patients included in the study was 25+/-5.64 years and the mean spherical equivalent of the 117 eyes that underwent Lasik0 was -5.33+/-1.22 preoperatively and -0.21+/-0.38 postoperatively. Hundred and two eyes of 117 (87%) achieved uncorrected visual acuity (UCVA) of 20/20 or better after WFO Lasik and 104 of 117 eyes (89%) were within +/-0.5D of the attempted refractive correction. There was a 1.96-fold increase in total root-mean-square of higher order aberrations. Induced changes in seven of the 22 higher order Zernike terms showed a significant linear correlation with the refractive correction attempted. Larger ablation zones induced less spherical aberration.


CONCLUSIONS
In spite of an excellent visual outcome, WFO Lasik induces significant higher order aberrations. Large ablation zones reduce the induction of spherical aberration.
Medical Research Foundation, Sankara Nethralaya, 18 College Road, Chennai, Tamil Nadu, India.
Prema
P
Padmanabhan
Subam S
SS
Basuthkar
Roy
R
Joseph
D000328:Adult; D001251:Astigmatism / Q000601:surgery; D004867:Equipment Design; D005128:Eye Diseases / Q000453:epidemiology / Q000209:etiology; D006801:Humans; D020731:Keratomileusis, Laser In Situ / Q000295:instrumentation / Q000379:methods*; D009216:Myopia / Q000601:surgery*; D018579:Patient Selection; D011183:Postoperative Complications / Q000453:epidemiology; D011446:Prospective Studies; D012029:Refraction, Ocular / Q000502:physiology; D014792:Visual Acuity / Q000502:physiology*; D055815:Young Adult