泪功能异常常表现多泪或少泪。多泪包括泌泪亢进(流泪)、排泪障碍(泪溢)和假泪溢症;少泪为泌泪障碍,常表现干眼,临床上常见。流泪尤多见,但常为眼病症状之一,将随原发病痊愈而消失。就泪器病而言,泪溢较流泪约多见2.5倍。泪功能异常,尤其轻度干眼症诊断困难,检查方法虽多,但结果可靠者少。因分泌及排泪功能互相影响,反射性分泌功能随排泪障碍而减退;所有检查都难免影响泪功能,许多排泪功能检查法会影响排泪功能;基础泪和保留泪取样困 Abnormal tear often show more tears or less tears. More tears, including hyperthyroidism (tears), drainage disorders (tearing) and false teratogenic disease; less tears for the tear disorders, often dry eyes, clinically common. Tears are more common, but often one of the symptoms of eye disease, will disappear as the original disease heal. In terms of lacrimal disease, tears overflow more common than 2.5 times. Tear function abnormalities, especially mild dry eye diagnosis difficult, although the inspection method is more, but the results are less reliable. Reflect the secretory function with the tears due to secretion and tear affect each other, all checks will inevitably affect the tear function, many of the tear function test will affect the tear function; basic tears and retention of tears trapped sleepy