干眼症仍是许多发展中国家儿童致盲的最重要原因。维生素A缺乏可导致伴有或不伴有基质水肿和溃疡的点状上皮角膜病变。唯一有效的治疗方法是全身使用维生素A如维甲棕榈酸酯(或其他酯类)。作者在研究病房曾经治疗50例病人, Dry eye is still the most important cause of blinding in many developing countries. Vitamin A deficiency can result in punctate epithelial keratopathy with or without stromal edema and ulceration. The only effective treatment is the systemic use of vitamin A such as retinyl palmitate (or other esters). The author studied 50 patients in a ward,