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Soft contact lens wear affects peripheral vision
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FORT LAUDERDALE, Fla. — Soft contact lens wear changed off-axis wavefront aberrations in eyes fitted with lenses compared with naked eyes, according to a poster presented at the Association for Research in Vision and Ophthalmology meeting here.
"While considerable attention has been in recent years to aberrations associated with foveal vision, relatively little interest has been shown in the aberrations for peripheral vision," Asaki Suzaki, MD, and colleagues said in the poster abstract. "Although it is likely that soft contact lens is effective against the off-axis aberration correction of the eye, few reports are available on off-axis optical characteristics of the eye with soft contact lenses."
The study included 20 eyes of 10 patients fitted with spherical soft contact lenses with powers of plano, –3 D and –7 D. Patients underwent analysis of wavefront aberrations with the Wavefront Analyzer (Topcon Medical Systems).
Patients were directed to fixate on five points of an inner fixation target: center and 4.5° off-axis upward, downward, right and left.
Investigators used normalized Zernike polynomials to analyze wavefront aberrations to the sixth order across a 6-mm diameter area in the pupil center. They calculated differences between root mean square (RMS) values of each Zernike coefficient between off-axis and central fixation.
Vertical and horizontal coma ranged from 0 D to –7 D in eyes fitted with lenses, the authors said.
Study data showed that variations in all RMS values between naked eyes and fitted eyes were statistically significant (P < .05), they reported.
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