Twenty-four young adults with myopia in both eyes and no anisometropia participated in this study. Observers were instructed to read one A4-sized page of Chinese text at different levels of illuminance and text contrast, while their reading distance, head tilt angle and reading speed were recorded using an electromagnetic motion tracking system. Four illuminances (3, 30, 300 and 600 lx) and two text contrast levels (90% and 45%) were tested in randomised order. Observers tended to shorten their reading distance and increase their head tilt angle when reading at low illuminance. In addition, their reading speed was markedly slower at low illuminance and low contrast. These effects were found for both text contrast conditions but were greater at low contrast. Illuminance and text contrast play a critical role in myope’s reading behaviour. An illuminance of 300 lx or more with high-contrast text allows for good reading posture and rapid reading of Chinese text.

中文翻译：

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照度和对比度对近视患者中文文本阅读的影响

24 名双眼近视且没有屈光参差的年轻人参加了这项研究。观察者被要求在不同的照度和文本对比度水平下阅读一页 A4 大小的中文文本，同时使用电磁运动跟踪系统记录他们的阅读距离、头部倾斜角度和阅读速度。以随机顺序测试了四种照度（3、30、300 和 600 lx）和两种文本对比度级别（90% 和 45%）。观察者在低照度下阅读时倾向于缩短阅读距离并增加头部倾斜角度。此外，在低照度和低对比度下，他们的阅读速度明显变慢。在两种文本对比度条件下都发现了这些效果，但在低对比度下效果更好。照度和文本对比度在近视的阅读行为中起着至关重要的作用。