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K. Baskaran, B. Theagarayan, S. Carius, J. Gustafsson; Ocular Aberrations in the Peripheral Visual Field With a Commercial Open-View Aberrometer. Invest. Ophthalmol. Vis. Sci. 2010;51(13):3951.
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The interest in off-axis aberrations has increased with the discovery of a possible link between myopia development and peripheral optics. The most common technology to measure the off-axis aberrations is a Shack-Hartmann wavefront aberrometer. This is the first study to report peripheral aberrations in a large sample of emmetropic population with a commercial open-view Shack-Hartmann aberrometer.
The commercial open-view Shack-Hartmann aberrometer COAS-HD VR was used to measure the aberrations in the peripheral vision. Aberrations of the right eye of 30 emmetropes (24 ± 4 years) were studied. Off-axis aberrations were measured in steps of 10° out to ± 30° in the horizontal visual field. The subjects turned their eye to view the off-axis fixation target (light emitting diode placed at 3 meters) during the measurement. The resulting wavefront aberrations were parameterized with Zernike coefficients for a 5 mm diameter pupil. All analyzes are reported according to optical society of America (OSA) recommended standards.
Aberrations from the 2nd to 6th order and the total higher-order root-mean-square (HO RMS) were analyzed using one-way ANOVA. The defocus C02 was significantly myopic in the nasal visual field (+20°, +30°) whereas there was no significant difference in the temporal visual field. Astigmatism C22 increased quadratically from ±10° in the periphery and coma C13 showed a linear increase across the horizontal visual field (p < 0.05). The spherical aberration C04 and the total HO RMS showed a significant change at ±30o.
Our results showed that in young emmetropes there was a significant increase of HO RMS at ±30°, which is expected. Astigmatism, horizontal coma, and spherical aberration vary systematically across the horizontal visual field in agreement with Seidel theory. The findings of our study with a large sample of emmetropic population agree with the previous studies done with laboratory built aberrometers.
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