鸟眼的相对大小比所有脊椎动物都大，大多数外观呈扁圆形，为扁平眼（flat eye）；鹰类眼球为球状（globular eye），鸮为筒状（tubular eye）。
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目的探讨睫状体扁平部造瘘术的适应证及治疗顽固的难治性青光眼的有效性与安全性。
OBJECTIVE to investigate the indication of the ciliary body flat fistulation and curative effect to tenacious and complex glaucoma.
所有患眼均在局部麻醉下巩膜穿刺放出视网膜下液后，行睫状体扁平部的闭合式三切口玻璃体切割手术。
All of the affected eyes underwent vitrectomy with closed triple incisions through the pars plana after release of subretinal liquid under the local anaesthesia.
前部近圆筒形，后部侧扁，头扁平，眼大口大，吻长而尖，呈三角形，上下颌等长，骨软。
Near the front cylinder, rear side of the flat, flat head, big eyes, long kiss and a sharp , triangular in shape, such as the long mandible, soft bone.
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