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Corneal Degenerations

 

II. Degenerative corneal conditions

Arcus senilis

It is bilateral peripheral lipoid infiltration of the corneal stroma. It is a very common condition in old age. Uncommonly it occurs in young age due to hyperlipidemia or juvenile diabetes (arcus juvenilis).

Clinical picture:-

Symptoms:

No symptoms, it never affect vision because it does not reach the central area.

Signs:

- It starts as an ark like opacity near the upper part of limbus. This opacity has a diffuse central border and a sharp peripheral border separated from the periphery by a clear zone (the lucid interval of Vogt).

- Then a similar arc develops lower down. Then both arks extend circumferentially till they fuse with each other forming a complete ring.

Differential diagnosis: from pannus siccus.

Treatment: No treatment.