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Myopic shift seen 1 year after wavefront-guided myopic LASIK
A comparison of wavefront aberrometry results 1 day and 1 year after myopic LASIK showed a slight myopic shift and an increase in higher-order aberrations, according to a study.
The prospective study included 105 eyes of 105 patients who underwent myopic wavefront-guided LASIK.
Inclusion criteria were stability of refraction with less than 0.5 D of spherical change in the previous year, discontinuation of soft contact lens use at least 1 week before preoperative evaluation, corrected distance visual acuity of at least 20/20, age older than 21 years and ability to participate in postoperative examinations for 12 months.
Patients with rigid gas permeable contact lenses, severe dry eye disease, severe blepharitis, corneal abnormalities, irregular mires on central keratometry, projected postoperative posterior corneal thickness less than 250 µm, a variation of 0.75 D in sphere or 0.50 D in cylinder from baseline, and other ocular or systemic conditions were excluded.
Investigators recorded objective wavefront aberrometric refractions preoperatively and 1 day and 1 year postoperatively. They also evaluated subjective manifest refractions at 1 year.
There was a mean myopic shift in spherical equivalent refraction of 0.33 D from 1 day to 1 year. No eyes had a hyperopic shift of more than 1 D.
From 1 day to 1 year, there was a significant increase in coma (P = .001), an insignificant change in trefoil, a significant increase in spherical aberration (P = .011) and a significant increase in root mean square error (P = .026).
The number of eyes within 1 D of emmetropia spherical equivalent changed insignificantly from 1 day to 1 year. – by Matt Hasson
Disclosure: Manche reports he has equity in Calhoun Vision, Krypton Vision, Refresh Innovations, Veralase and Seros Medical and is a consultant for Oculeve, Best Doctors and Gerson Lehrman. Yu reports no relevant financial disclosures.