DR. KAAVIYA ASOKAN

DR. VENI PRIYA SIGAMANI

Abstract

Coloured halos occur due to accumulation of fluid in the corneal epithelium and due to alterations in refractive condition of the corneal lamellae. It is usually seen in glaucoma, cataract and sometimes in conjunctivitis also. Visual hallucination is seen in migraine, seizure disorders and sometimes in psychiatry disorders. My case is a 55 year old female who came with complaints of severe headache and sudden onset of defective vision on right side for 3 days. She complained of seeing multiple coloured rings in star pattern, each episode lasting for 10-15 minutes. Confrontation test showed right homonymous hemianopia. CT Brain showed left subacute occipital lobe infarct. Gonioscopy and dilated fundus examination showed no evidence of glaucoma.

Coloured halos occurs not only due to glaucoma or cataract, rarely it can also suggest occipital lobe infarct. A thorough history and a detailed systemic and ocular examination in all cases of coloured halos will help in diagnosing rare causes.