偃月侵睛(downbearing thin nebula),中醫病名,屬黑睛病類,因年老體衰,肝腎不足,肝血虧虛,或竭視勞瞻,耽酒嗜辣,痰火壅滯風輪所致。臨床以黑睛上緣或四周發生灰白色混濁,狀若月牙或棗花等為特徵的黑睛病。[1]