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.
- 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?