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- Squinting is the action of looking at something with partially closed eyes. Squinting is most often practiced by people who suffer from refractive errors of the eye who either do not have or are not using their glasses. Squinting helps momentarily improve their eyesight by slightly changing the shape of the eye to make it rounder, which helps light properly reach the fovea. Squinting also decreases the amount of light entering the eye, making it easier to focus on what the observer is looking at by removing rays of light which enter the eye at an angle and would need to otherwise be focused by the observer's faulty lens and cornea. Pinhole glasses, which severely restrict the amount of light entering the cornea, have the same effect as squinting. It is a common belief that squinting worsens eyesight. However, according to Robert MacLaren, a professor of ophthalmology at the University of Oxford, this is nothing more than an old wives' tale: the only damage that can be caused by squinting for long periods is a temporary headache due to prolonged contraction of the facial muscles. Squinting is also a common involuntary reflex, especially among people with light colored eyes, during adaptation to a sudden change in lighting such as when one goes from a dark room to outdoors on a sunny day to avoid pain or discomfort of the eyes. The pupillary light reflex caused by adjustment to light takes around five minutes in people with healthy eyes, so squinting and pain after that could be a sign of photophobia. Look up squint in Wiktionary, the free dictionary. (en)
- 眯眼是指眼睛部分闭合時的狀態。 那些患有眼屈光不正的人可能最喜歡眯眼，當他们不戴眼镜時，眯眼有助于暂时改善他们的视力，因为它稍微改变了眼睛的形状，使其变得更圆，这有助于光线到达。 人们普遍认为，眯眼会使视力恶化。但是牛津大学眼科教授予以否認，並表示长期眯眼可能造成的唯一伤害是由于的长期收缩會导致暂时性的頭痛。 眯眼也是一种常见的不自主反射，尤其是對於浅色眼睛的人來說，例如他們在阳光明媚的日子裡突然从黑暗的房间來到户外，之前眼睛已適應的光线突然变化时，瞇起眼睛可以避免眼睛疼痛或不适。 (zh)
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- 眯眼是指眼睛部分闭合時的狀態。 那些患有眼屈光不正的人可能最喜歡眯眼，當他们不戴眼镜時，眯眼有助于暂时改善他们的视力，因为它稍微改变了眼睛的形状，使其变得更圆，这有助于光线到达。 人们普遍认为，眯眼会使视力恶化。但是牛津大学眼科教授予以否認，並表示长期眯眼可能造成的唯一伤害是由于的长期收缩會导致暂时性的頭痛。 眯眼也是一种常见的不自主反射，尤其是對於浅色眼睛的人來說，例如他們在阳光明媚的日子裡突然从黑暗的房间來到户外，之前眼睛已適應的光线突然变化时，瞇起眼睛可以避免眼睛疼痛或不适。 (zh)
- Squinting is the action of looking at something with partially closed eyes. Squinting is most often practiced by people who suffer from refractive errors of the eye who either do not have or are not using their glasses. Squinting helps momentarily improve their eyesight by slightly changing the shape of the eye to make it rounder, which helps light properly reach the fovea. Squinting also decreases the amount of light entering the eye, making it easier to focus on what the observer is looking at by removing rays of light which enter the eye at an angle and would need to otherwise be focused by the observer's faulty lens and cornea. (en)
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