Kang Pauline, Fan Yvonne, Oh Kelly, Trac Kevin, Zhang Frank, Swarbrick Helen
School of Optometry and Vision Science, The University of New South Wales, Sydney, New South Wales, Australia.
Optom Vis Sci. 2012 Jul;89(7):1014-21. doi: 10.1097/OPX.0b013e31825da339.
To investigate changes in peripheral refraction with under-, full, and over-correction of central refraction with commercially available single vision soft contact lenses (SCLs) in young myopic adults.
Thirty-four myopic adult subjects were fitted with Proclear Sphere SCLs to under-correct (+0.75 DS), fully correct, and over-correct (-0.75 DS) their manifest central refractive error. Central and peripheral refraction were measured with no lens wear and subsequently with different levels of SCL central refractive error correction.
The uncorrected refractive error was myopic at all locations along the horizontal meridian. Peripheral refraction was relatively hyperopic compared to center at 30 and 35° in the temporal visual field (VF) in low myopes and at 30 and 35° in the temporal VF and 10, 30, and 35° in the nasal VF in moderate myopes. All levels of SCL correction caused a hyperopic shift in refraction at all locations in the horizontal VF. The smallest hyperopic shift was demonstrated with under-correction followed by full correction and then by over-correction of central refractive error. An increase in relative peripheral hyperopia was measured with full correction SCLs compared with no correction in both low and moderate myopes. However, no difference in relative peripheral refraction profiles were found between under-, full, and over-correction.
Under-, full, and over-correction of central refractive error with single vision SCLs caused a hyperopic shift in both central and peripheral refraction at all positions in the horizontal meridian. All levels of SCL correction caused the peripheral retina, which initially experienced absolute myopic defocus at baseline with no correction, to experience absolute hyperopic defocus. This peripheral hyperopia may be a possible cause of myopia progression reported with different types and levels of myopia correction.
研究在年轻近视成年人中，使用市售单焦软性接触镜（SCL）对中央屈光进行欠矫、全矫和过矫时周边屈光的变化。
34名近视成年受试者佩戴Proclear Sphere SCL，分别对其明显的中央屈光不正进行欠矫（+0.75 DS）、全矫和过矫（-0.75 DS）。在未佩戴镜片时以及随后在不同程度的SCL中央屈光不正矫正情况下测量中央和周边屈光。
在水平子午线上的所有位置，未矫正的屈光不正均为近视。与低度数近视者颞侧视野（VF）中30°和35°处的中心相比，周边屈光相对远视；与中度近视者颞侧视野中30°和35°处以及鼻侧视野中10°、30°和35°处的中心相比，周边屈光相对远视。所有程度的SCL矫正均导致水平视野中所有位置屈光出现远视性偏移。中央屈光不正欠矫时远视性偏移最小，其次是全矫，然后是过矫。与未矫正相比，低度数和中度近视者佩戴全矫SCL时相对周边远视增加。然而，欠矫、全矫和过矫之间在相对周边屈光轮廓上未发现差异。
使用单焦SCL对中央屈光不正进行欠矫、全矫和过矫会导致水平子午线上所有位置的中央和周边屈光出现远视性偏移。所有程度的SCL矫正均使最初在基线未矫正时经历绝对近视性离焦的周边视网膜出现绝对远视性离焦。这种周边远视可能是不同类型和程度的近视矫正所报告的近视进展的一个可能原因。
