眼裂长度为内眦点到为外眦点的直线距离。简单来说，眼裂（睑裂）就是内眦点到外眦点的直线距离，内眦点就是上下眼睑的内遇合处，外眦点就是上下眼睑的外遇合处。
眼裂过大、眼睑内翻或眼睑外翻都属于缺陷。
Excessive tearing or evidence of entropion or ectropion is to be penalized.
眼角开大术所使用的方法是切开外眦，拉长横向眼裂的手术，使眼睛变大。
Big eyes to open surgery method is used to cut external canthus, elongated horizontal eye cleft surgery to make eyes bigger.
方法运用针刺治疗动眼神经麻痹，测定治疗前后眼裂、瞳孔变化值以及眼球运动范围值。
Method Acupuncture was used to treat oculomotor paralysis. The sizes of palpebral fissure and pupil and the range of eye movement were determined before and after the treatment.
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