Effect of ametropia on peripheral refraction.
Peripheral refraction was measured in 62 eyes along the horizontal meridian from 60 degrees nasally to 60 degrees temporally, using a Topcon refractometer. The amount of astigmatism was found to increase progressively, although less than predicted theoretically, toward the periphery in 91% of the eyes. Dividing the sample into myopes, hyperopes, and near-emmetropes showed that the type of astigmatism differed significantly with each group of eyes and that this factor played a most important role.
D000293:Adolescent; D000328:Adult; D001251:Astigmatism / Q000175:diagnosis; D006801:Humans; D006956:Hyperopia / Q000175:diagnosis; D008875:Middle Aged; D009216:Myopia / Q000175:diagnosis; D012029:Refraction, Ocular; D012030:Refractive Errors / Q000175:diagnosis*