角结膜干燥症又名干眼症 ,多发于 4 0～ 5 0岁 ,女性常见。它是一种多因素疾病 ,泪膜的数量和质量直接影响眼表状态。患者开始症状是烧灼感、异物感、干燥和畏光 ,随病情进展而加重。近年来 ,随着其病因和致病机制研究的不断深入 ,对这一疾病的认识也逐步加深。1　定义和分类19 Conjunctival xerostomia, also known as dry eye syndrome, occurs in 40 ~ 50 years old, common in women. It is a multifactorial disease and the quantity and quality of the tear film directly affects the status of the ocular surface. The patient begins to have symptoms of burning, foreign body sensation, dryness and photophobia, which aggravates as the condition progresses. In recent years, as its etiology and pathogenic mechanism of research continues to deepen, the understanding of this disease has gradually deepened. 1 Definition and classification 19