Munjal Akul, Kaufman Evan J.
Medical College of Georgia
University of Virginia Medical Center
The eye is one of the most anatomically complex regions of the body, and often systemic diseases manifest in the eye, sometimes these ophthalmic manifestations predate other systemic manifestations. The cornea is the thin clear covering of the eye. Arcus senilis (cornea senilis) are lipid deposits that appear as rings on the outer region of the cornea. They are usually gray or white and are usually opaque. They often appear denser in the superior and inferior regions. They can grow with time, and can eventually form a ring around the entire cornea. The diagnosis of corneal arcus is made visually by examination with a biomicroscope (slit lamp). The diagnosis of corneal arcus can be confused with limbus sign (calcium deposits in the cornea).
眼睛是人体解剖结构最复杂的部位之一，许多全身性疾病会在眼部表现出来，有时这些眼部表现会先于其他全身性表现出现。角膜是覆盖在眼睛上的一层薄而透明的组织。角膜老年环（老年角膜）是脂质沉积，表现为角膜外层区域的环状物。它们通常呈灰色或白色，通常是不透明的。它们在上部和下部区域往往显得更密集。它们会随着时间增长，最终可能会在整个角膜周围形成一个环。角膜老年环通过生物显微镜（裂隙灯）检查进行肉眼诊断。角膜老年环的诊断可能会与角膜缘体征（角膜中的钙沉积）相混淆。
