Coat's disease

Coat's disease showing telangiectatic vessels and 
exudatesin the peripheral retina.

Although most commonly seen in diabetic retinopathy, 
hard exudates in the macula may suggest the presence 
of peripheral retinal vascular disorders such as Coat's, 
von Hippel's tumour or  macroaneurysm.

In the examination, most cases of Coat's disease seen are of the less severe types in which there are peripheral features of 
Coat's disease. The severe types of Coat's disease in  which there are leucocoria, strabismus and extensive exudative retinal 
detachment may appear in other sections such as ocular motility examination.
Most patients are of the young age and usually male but occasionally you may get older patients with adult-onset Coat's 

The macula shows hard exudate with oedema. The peripheral retina has telangiectatic and tortuous blood vessels (which 
may be occluded by the exudates) with subretinal exudates. There may be exudative retinal detachment.

Look for:

  • absence of similar changes in the fellow eye (Coat's disease is usually an  unilateral condition)


1. When can you see light bulb changes in Coat's disease?

2. How would manage the condition?


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