Condition of vision in which there is discomfort or a reduction in the ability to see significant objects, or both, due to an unsuitable distribution or range of luminance or to extreme contrasts in space or time.

• 由于亮度分布或范围的不合理分配或空间或时间上的强烈反差，而引起的不舒适视觉条件或观察能力的下降。