Contact Lens and Visual Optics Laboratory, School of Optometry and Vision Science, Queensland University of Technology, Brisbane, Australia.
Ophthalmic Physiol Opt. 2013 Jan;33(1):15-25. doi: 10.1111/opo.12003. Epub 2012 Dec 1.
To examine the symmetry of corneal changes following near work in the fellow eyes of non-amblyopic myopic anisometropes.
Thirty-four non-amblyopic, myopic anisometropes (minimum 1 D spherical equivalent anisometropia) had corneal topography measured before and after a controlled near work task. Subjects were positioned in a headrest to minimise head movements and read continuous text on a computer monitor for 10 min at an angle of 25 degrees downward gaze and an accommodation demand of 2.5 D. Measures of the morphology of the palpebral aperture during primary and downward gaze were also obtained.
The more and less myopic eyes exhibited a high degree of interocular symmetry for measures of palpebral aperture morphology during both primary and downward gaze. Following the near work task, fellow eyes also displayed a symmetrical change in superior corneal topography (hyperopic defocus) which correlated with the position of the upper eyelid during downward gaze. Greater changes in the spherical corneal power vector (M) following reading were associated with a narrower palpebral aperture during downward gaze (p = 0.07 for more myopic and p = 0.03 for less myopic eyes). A significantly greater change in J0 (an increase in against the rule astigmatism) was observed in the more myopic eyes (-0.04 ± 0.04 D) compared to the less myopic eyes (-0.02 ± 0.06 D) over a 6 mm corneal diameter (p = 0.01).
Changes in corneal topography following near work are highly symmetrical between the fellow eyes of myopic anisometropes due to the interocular symmetry of the palpebral aperture. However, the more myopic eye exhibits changes in corneal astigmatism of greater magnitude compared to the less myopic eye.
研究非弱视近视屈光参差者的近距工作对其对侧眼的角膜变化的对称性。
34 名非弱视、近视屈光参差者（最小等效球镜度相差 1 屈光度）进行了角膜地形图检查，检查分别在近距工作任务前后进行。受试者坐在头托上，以最大限度减少头部运动，并在 25 度向下注视角和 2.5 屈光度调节需求的情况下，连续 10 分钟阅读计算机显示器上的连续文本。还获得了在原发性和向下注视期间眼睑开口形态的测量值。
在原发性和向下注视期间，高度近视眼和低度近视眼的眼间对称性非常高，在原发性和向下注视期间，睑裂形态的测量值具有高度的眼间对称性。近距工作任务后，同伴眼的上角膜地形也出现了与下眼睑位置相对应的对称变化（远视离焦）。阅读后角膜球面力向量（M）的变化越大，下眼睑注视时睑裂越窄（高度近视眼 p = 0.07，低度近视眼 p = 0.03）。在 6mm 角膜直径范围内，高度近视眼（0.04±0.04D）的 J0（逆规散光增加）变化明显大于低度近视眼（0.02±0.06D）（p = 0.01）。
近视屈光参差者的近距工作后，角膜地形的变化在对侧眼之间非常对称，这是由于睑裂的眼间对称性。然而，与低度近视眼相比，高度近视眼的角膜散光变化幅度更大。
