红眼是一种常见问题，可能影响单眼或双眼。发红是因为眼睛表面的血管。这些血管由于刺激或疾病而扩张。
如果出现以下情况，请立即就医：
- 视力骤变。
- 红眼伴有严重头痛、眼睛疼痛、发热或畏光。
- 伴有胃部不适或呕吐。
- 红眼由异物或化学物质溅入眼睛引起。
- 突然开始看到光源周围有光晕。
- 眼睛有异物感。
- 眼内或眼周肿胀。
- 无法睁开眼睛或保持眼睛睁开。
何时应预约医务人员就诊
有时，短暂的红眼无需担心。如果您认为眼睛发红由非处方滴眼液引起，可尝试其他品牌或暂停使用。
若眼睛发红持续数日未消退，尤其伴随浓稠脓液或黏液持续一周或更久的情况下，应联系医务人员预约就诊。
出现以下情况时，应联系眼科医生：
- 眼睛发红并伴有疼痛。
- 曾经接受过眼科手术或眼部注射。
显示参考文献
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Original article: https://www.mayoclinic.org/zh-hans/symptoms/red-eye/basics/when-to-see-doctor/sym-20050748