老年环也称角类膜脂环,是眼角膜周边呈灰白色混浊的弧或环的总称。通常较多见于老年人,由于仅局限于角膜周边部位,并不影响视力,因此,以往认为系一般老年变性,未引起人们的重视。但为什么有些青、中年人也出现老年环?近几年来,国内外有关专家研究认为:老年环形成 Annular ring, also known as the angular type of membrane algae, is a general term for the arc of white or turbid arcs or rings around the cornea. Usually more common in the elderly, because only limited to the corneal peripheral parts, does not affect the vision, therefore, in the past that Department of General degeneration, has not aroused people’s attention. But why some green, middle-aged people also appear in the elderly ring? In recent years, domestic and foreign experts believe that: the formation of the elderly ring