它们是由结膜和巩膜间的出血造成的。
They are caused by bleeding between the conjunctiva and the sclera.
结膜通常保持完整，但是结膜下出血可造成环状血性水肿(如图所示)。
The conjunctiva often remains intact, but subconjunctival bleeding can produce circumferential bloody chemosis (shown).
图片中所展示的是结膜下出血，该情况可通过保守疗法轻易地在门诊就得到处理。
The image shown is of a subconjunctival hemorrhage, a condition that can be easily managed with conservative treatment on an outpatient basis.
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