Visual Outcomes and Higher Order Aberrations Following LASIK on Eyes with Low Myopia and Astigmatism
Smita Agarwal1, 2, Erin Thornell1, *, Chris Hodge3, Gerard Sutton4, Paul Hughes3
1 Wollongong Eye Specialists, 13 Market st, Wollongong, Australia
2 University of Wollongong, Northfields ave, Wollongong, Australia
3 Vision Eye Institute, 8-10 Woniora rd, Hurstville, Australia
4 University of Sydney, Camperdown, Australia
Laser-Assisted in situ Keratomileusis (LASIK) can induce corneal aberrations that can impact vision and patient satisfaction. Recent developments in laser technologies have helped minimise these aberrations.
To assess the quality of vision and change in Higher-Order Aberrations (HOAs) following wavefront-optimized LASIK in low-myopic astigmatic patients.
LASIK was performed on a total of 76 eyes in patients with myopia <4.0 D and cylinder <2.0 D using the WaveLight® EX500 excimer and FS200 femtosecond laser platform. Visual acuity, contrast sensitivity and HOAs were measured at 1 and 3 months postoperatively and compared to preoperative values. Subjective quality of vision was assessed pre- and postoperatively using a VF14 questionnaire.
Mean postoperative Spherical Equivalent (SE) was -0.09 ± 0.26 µm with 95% of patients within ± 0.5 D of attempted SE. Postoperative uncorrected distance visual acuity was 20/20 or better for 96% of patients. Contrast sensitivity increased against horizontal and vertical gratings at all spatial frequencies except for vertical gratings at 18 cycles/degree. Spherical aberration and total HOA increased by 0.085 µm and 0.13 µm respectively. The mean VF14 score increased from 89.2 ± 16.7% to 99 ± 1.4% postoperatively.
LASIK performed using the WaveLight® EX500 excimer and WaveLight® FS200 laser platform provided improved contrast sensitivity and visual acuity with minimal introduction of HOAs, making it a suitable platform for low myopic astigmatic patients.
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* Address correspondence to this author at the Wollongong Eye Specialists, 13 Market st, Wollongong, NSW 2500, Australia; Tel: +61 2 4227 6388; E-mail: firstname.lastname@example.org