裸眼就可观察到角膜溃疡为位于角膜上的白色或灰色圆形病灶。
A corneal ulcer can be seen as a white or gray round spot on the cornea that is visible with the naked eye.
溃疡是圆形或不规则形的凹陷，全层表皮及部分真皮缺失。
Ulcers are rounded or irregularly shaped excavations that result from complete loss of the epidermis plus some portion of the dermis.
病斑近圆形，周围有黄晕，但不象柑桔溃疡病那样有火山口开裂。
The typical symptom appeared as approximately circular spot with a yellow halo, without crateriform symptom as that of citrus canker.
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