Clinical Evaluation of Sensory Heterotropia.

Min, Byung Moo; Min, Woog Ki; Lee, Kyung Moo; Kim, Yong Baek

Original Article

Journal of the Korean Ophthalmological Society 1989;30(5):767-772.
Published online May 1, 1989.

Clinical Evaluation of Sensory Heterotropia.

Byung Moo Min, Woog Ki Min, Kyung Moo Lee, Yong Baek Kim

Department of Ophthalmology, Chungnam National University, Chungnam, Korea.

Sensory Heterotropia 에 대한 고찰

민병무(Byung Moo Min),이경무(Kyung Moo Lee),민욱기(Woog Ki Min),김용백(Yong Baek Kim)

Abstract

Sensory Heterotropia is defined as a secondary deviation following loss or severe reduction in visual function in one eye. We have analyzed the records of 68 patients with sensory heterotropia in order to find the incidence, etiologic causes, the factors influencing the direction of the deviation, and the amount of deviation. The incidence of sensory heterotropia was 1.1% of total out patients, and 10.5% of strabismic patients. The major causative factors of sensory heterotropia was anisometropia(33.8%) followed in frequency by uncorrected aphakia(25.0%), cataract(16.2%), retina and vitreous diseases(16.2%), optic nerve atrophy(8.8%) and corneal opacity(2.9%). Esotropia and exotropia were encountered with almost equal frequency when the onset of visual impairment occured between birth and 5 years of age, but exotropia predominated in older children and adult. Those was statistically significant(p<0.01). The direction of a sensory heterotropia was determined by the refractive error of the sound eye, i.e., if the sound eye was emmetropic or myopic, thd blind eye was predominantly exotropic, and if it is hyperopic, it was predominantly esotropic. Also, duration of visual impairment was related to the amount of deviation in exotropic patients. If the duration was under 5 years, the amounts of deviation was 16.3 prism, and over 5 years, it was 25.5 prism, and difference was statistically significant.

Key Words: Sensory heterotropia;direction deviation;amount of deviation;refractive error