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Photophobia measurement in intermittent exotropia using the contrast sensitivity test

 Seung Ah Chung ; Soolienah Rhiu ; Jong Bok Lee ; Seung Han Han 
 Graefes Archive for Clinical and Experimental Ophthalmology, Vol.251(5) : 1405~1411, 2013 
Journal Title
 Graefes Archive for Clinical and Experimental Ophthalmology 
Issue Date
BACKGROUND: To assess the presence and extent of photophobia in children with intermittent exotropia (X[T]) using the contrast sensitivity test. METHODS: Fifty-eight children with X(T) and 34 normal controls were studied with the functional acuity contrast test. Each participant viewed the stimuli of contrast monocularly and binocularly under photopic and mesopic conditions, performed with and without glare. Photophobia was defined as a reduction of contrast sensitivity caused by glare light. We compared the photophobia of children with X(T) to that of normal controls, and to the photophobia 3 months after muscle surgery. RESULTS: With stimuli of glare, the contrast sensitivity of children with X(T) was suppressed at intermediate spatial frequencies under mesopic condition (p = 0.006 for 6 cycles per degree [cpd], p = 0.027 for 12 cpd), whereas that of normal controls showed no difference. It occurred when X(T) patients viewed targets binocularly, and significantly improved after strabismus surgery (p = 0.003 at 6 cpd). The measured photophobia of X(T) was strongly correlated to the photophobia symptoms reported by parents (p = 0.002). CONCLUSIONS: The mesopic contrast sensitivity with glare can represent the photophobia of children with X(T). Contrast sensitivity may be a useful measure for monitoring symptoms related to X(T).
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1. 연구논문 > 1. College of Medicine > Dept. of Ophthalmology
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