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Session Title: Quality of vision evaluation techniques
Session Date/Time: Tuesday 08/10/2013 | 14:00-16:00
Paper Time: 15:22
Venue: Elicium 2 (First Floor)
First Author: : J.Cazal SPAIN
Co Author(s): : R. Gomez Salazar F. Castanera Molina J. Holladay
To quantify and characterize Ocular total, Corneal and Internal higher order aberrations in children measured with Nidek optical pathway difference (OPD)-Scan III
Clinica Oftalmologica TACIR,Centro Medico TEKNON ,Barcelona
Ocular wavefront aberrations were measured in one hundred forty-one eyes of 82 children were examined. Children with spherical equivalent refraction (SER) between + 7.0 D and -7.25 D and astigmatism up to 4.00 D. Wavefront aberrations were calculated using an objective method based with optical pathway difference (OPD)-Scan. Refractive error was obtained using a phoropter under natural accommodation . Subjects were categorised into three groups based on the mean SER: emmetropia (SER from -0.50 D to +0.50 D), myopia (SER greater than -0.50 D to -4.75 D), astigmatism (SER greater than -0.50 to 5.00 D) and hyperopia (SER greater than +0. 50 D to +7.00 D). Of the 83 participants, 25 were emmetropic, 18 were astigmatic 29 were hyperopic and 11 were myopic. The root mean square (RMS) values of higher-order aberrations, Zernike coefficients (third-, fourth- and fifth-order aberrations) and Rj (the ratio of third-, fourth- or fifth-order aberrations to total higher-order aberrations) were compared across the three refractive groups.
No significant correlations were found between the RMS values of total higher-order aberrations, third-order aberrations, fourth-order aberrations, fifth-order aberrations, spherical aberration or coma and SER. No significant differences in the RMS values of total higher-order aberrations or Rj were observed among the groups. The difference in fifth-order aberrations was statistically significant among the groups (p = 0.022); no other differences in higher-order aberration were found
Ocular wavefront aberrations are similar among most groups of children except for the myopic group natural accommodation for a distance target. There is evidence that myopes have a different amount of ocular higher-order aberrations than others .
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