Purpose: We term the visual field position from which the pupil appears most nearly circular as the pupillary circular axis (PCAx). The aim was to determine and compare the horizontal and vertical co-ordinates of the PCAx and optical axis from pupil shape and refraction information for only the horizontal meridian of the visual field. ududMethod: The PCAx was determined from the changes with visual field angle in the ellipticity and orientation of pupil images out to ±90° from fixation along the horizontal meridian for the right eyes of 30 people. This axis was compared with the optical axis determined from the changes in the astigmatic components of the refractions for field angles out to ±35° in the same meridian.ududResults: The mean estimated horizontal and vertical field coordinates of the PCAx were ud(‒5.3±1.9°, ‒3.2±1.5°) compared with (‒4.8±5.1°, ‒1.5±3.4°) for the optical axis. The vertical co-ordinates of the two axes were just significantly different (p =0.03) but there was no significant correlation between them. Only the horizontal coordinate of the PCAx was significantly related to the refraction in the group.ududConclusion: On average, the PCAx is displaced from the line-of-sight by about the same angle as the optical axis but there is more inter-subject variation in the position of the optical axis. When modelling the optical performance of the eye, it appears reasonable to assume that the pupil is circular when viewed along the line-of-sight.
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机译:目的:我们将视野位置定义为瞳孔圆轴(PCAx),瞳孔从该位置最接近圆形。目的是仅根据视野的水平子午线,根据瞳孔形状和折射信息确定和比较PCAx和光轴的水平和垂直坐标。 ud ud方法:根据30人右眼沿水平子午线注视的椭圆度和瞳孔图像方向随视场角的椭圆度和方向变化至±90°而确定的PCAx。将该轴与从同一子午线中视场角达±35°的折射的像散分量变化确定的光轴进行比较。 ud ud结果:PCAx的平均水平和垂直视场估计坐标为 ud(‒5.3±1.9°,‒3.2±1.5°)与光轴(‒4.8±5.1°,‒1.5±3.4°)相比。两个轴的垂直坐标只是有很大的不同(p = 0.03),但是它们之间没有显着的相关性。结论:平均而言,PCAx偏离视线的角度与光轴的角度大致相同,但相互之间的夹角更大。 -光轴位置的变化。在对眼睛的光学性能进行建模时,可以合理地假设沿视线观察时瞳孔是圆形的。
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