Efficacy of spherical aberration correction based on contact lens power.
OBJECTIVE
To investigate the efficacy of spherical aberration (SA) correction with aspheric contact lenses (aspheric lenses) based on lens power, and compare the results with those of spherical contact lenses (spherical lenses).


METHODS
Ocular higher-order aberrations were measured with a wavefront sensor, in 11 myopic subjects wearing an aspheric lens (Medalist Fresh fit (PUREVISION 2 HD); Bausch+Lomb) or a spherical lens (ACUVUE Oasys; Johnson & Johnson). Six different lens powers (-7.00 diopters (D), -5.00 D, -3.00 D, -1.00 D, +1.00 D, +3.00 D) were used for all subjects. The amount of SA correction from the contact lens at each power was calculated as the difference between SA with the contact lens on-eye and SA of the eye alone.


RESULTS
For the spherical lenses, SA correction was close to 0.00 μm for the +1.00 D lens, became more positive as the labeled lens power increased and became more negative as the labeled lens power decreased. For the aspheric lenses, SA correction was consistent, from -0.15 to -0.05 μm, for all lens powers except for the -1.00 D lens. SA correction for the spherical and aspheric lenses was significantly different at -7.00 D (p=0.040), -3.00 D (p=0.015), -1.00 D (p<0.001), +1.00 D (p=0.006), and +3.00 D (p<0.001) powers.


CONCLUSIONS
An aspheric lens is capable of correcting SA at different lens powers, and has SA correction in the range of -0.15 to -0.05 μm over a 6mm aperture.
Department of Ophthalmology, Osaka University Graduate School of Medicine, Osaka, Japan. Electronic address: skoh@ophthal.med.osaka-u.ac.jp.
Shizuka
S
Koh
Department of Ophthalmology, Osaka University Graduate School of Medicine, Osaka, Japan.
Naoyuki
N
Maeda
Hamada Eye Clinic, Osaka, Japan.
Tsunekazu
T
Hamada
Department of Ophthalmology, Osaka University Graduate School of Medicine, Osaka, Japan.
Kohji
K
Nishida
D000328:Adult; D003263:Contact Lenses, Hydrophilic / Q000145:classification*; D019781:Corneal Topography; D057108:Corneal Wavefront Aberration / Q000175:diagnosis* / Q000534:rehabilitation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005260:Female; D006801:Humans; D008297:Male; D009216:Myopia / Q000175:diagnosis* / Q000534:rehabilitation*; D016896:Treatment Outcome
Aspheric contact lens; Contact lens power; Spherical aberration