J Korean Ophthalmol Soc.
1987 Apr;28(2):447-453.
A Case of Ectopic Macula in Presumed Ocular Toxocariasis
- Affiliations
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- 1Department of Ophthalmology, College of Medicine, Keimyung University, Daegu, Korea.
Abstract
- The macula may be displaced by retinal scarring or fibrous strands, often as a result of retrolental fibroplasia. The displacement is usually temporal and may occur bilaterally but may also be superior or inferior and unilateral after severe retinitis(Toxocara canis). Ectopic macula causes a displacement of the visual line and thus occasionally produces a large positive angle kappa that simulates exotropia. Displacement of the macula also may be congenital. Ocular toxocariasis is recognized to be an important cause of childhood blindness. It usually results as a sequela of systemic infestation with the second or third stage larva of T. canis(visceral larval migrans). The roundworm Toxocara canis is an intestinal parasite of dogs. Humans are infected accidentally by ingesting infective ova from contaminated soil. Only on rare occasions has ocular involvement been reported in visceral larva migrans. Ocular toxocariasis can assume a variety of clinical forms. The authors experienced a case of ectopic macula in presumed ocular toxocariasis which was diagnosed on the basis of the clinical appearance and a history of exposure to puppy. A review of this subject is provided, with emphasis upon pathogenesis, clinical features, diagnostic approaches and therapeutic techniques.
