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| Glare (vision) ： ウィキペディア英語版 |
Glare (vision)
Glare is difficulty seeing in the presence of bright light such as direct or reflected sunlight or artificial light such as car headlamps at night. Because of this, some cars include mirrors with automatic anti-glare functions.
Glare is caused by a significant ratio of luminance between the task (that which is being looked at) and the glare source. Factors such as the angle between the task and the glare source and eye adaptation have significant impacts on the experience of glare.
==Discomfort and disability==
Glare can be generally divided into one types, discomfort glare and disability glare.
Discomfort glare results in an instinctive desire to look away from a bright light source or difficulty in seeing a task. Disability glare impairs the vision of objects without necessarily causing discomfort.〔(【引用サイトリンク】 title=CIE e-ILV: 17-330 disability glare )〕 This could arise for instance when driving westward at sunset. Disability glare is often caused by the inter-reflection of light within the eyeball, reducing the contrast between task and glare source to the point where the task cannot be distinguished. When glare is so intense that vision is completely impaired, it is sometimes called dazzle.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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