Atchison David A, Lucas Stephen D, Ashman Ross, Huynh Michael A, Schilt David W, Ngo Phuc Q
Ophthalmic and Visual Optics Group, School of Optometry, Queensland University of Technology, Australia.
Optom Vis Sci. 2006 Apr;83(4):213-21. doi: 10.1097/01.opx.0000214382.75847.c4.
The purpose of this study was to measure refraction and aberrations across the horizontal central visual field.
Cycloplegic refraction was measured on eight subjects at 13 points across the horizontal central 10 degrees of the retina using a Hartmann-Shack wavefront sensor. Refractions were converted into mean sphere (M), 90 degrees to 180 degrees astigmatism (J180), and 45 degrees to 135 degrees astigmatism (J45) components. For five subjects, higher-order aberrations were determined at the center and edges of the field.
Subtle changes in refraction were found to exist across the central 10 degrees of the retina, with changes in mean best sphere varying by up to half a diopter across this region and with smaller changes in astigmatism. Horizontal coma, but no other higher-order aberrations, varied systemically across the visual field; it varied linearly with angle but at different rates for the different subjects.
Subtle changes in cycloplegic refraction exist across the horizontal central 10 degrees of the retina. The results indicate the need for correct alignment when measuring objective refraction.
本研究的目的是测量水平中央视野的屈光和像差。
使用哈特曼-夏克波前传感器，在八名受试者视网膜水平中央10度的13个点上测量睫状肌麻痹验光。屈光度数被转换为平均球镜度（M）、90度至180度散光（J180）以及45度至135度散光（J45）分量。对于五名受试者，在视野中心和边缘测定高阶像差。
发现在视网膜中央10度范围内存在屈光的细微变化，该区域平均最佳球镜度变化高达0.5屈光度，散光变化较小。水平彗差而非其他高阶像差在整个视野中呈系统性变化；它随角度线性变化，但不同受试者的变化率不同。
在视网膜水平中央10度范围内存在睫状肌麻痹验光的细微变化。结果表明在测量客观验光时需要正确对准。
