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  • Testing of binocular contrast sensitivity as an objective measure of severity in intermittent exotropia

Testing of binocular contrast sensitivity as an objective measure of severity in intermittent exotropia
Reviewed by Fiona Rowe

4 December 2023 | Fiona Rowe (Prof) | EYE - Paediatrics, EYE - Strabismus
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The purpose of this study was to compare the binocular contrast sensitivity ratio (measured with the Vision CSV-100 vector chart) between 40 intermittent exotropia patients and 40 normal controls. The authors also evaluated the effect of intermittent exotropia compensation status and degree of deviation. The exotropia group comprised 22 males and 18 females aged 12.3 ±0.6 years, measuring 24.7 ±9.3PD at distance and 22.8 ±8.9PD at near. The control group comprised of 18 males and 22 females, aged 11.0 ±0.8 years. Binocular contrast sensitivity score was significantly reduced in intermittent exotropia vs. controls at all spatial frequencies (three, six, 12 and 18 cycles per degree) in mesopic and photopic light conditions. Those with larger deviation angles had worst binocular contrast sensitivity scores. Mean score was lower for those with a poor control scale score. The authors suggest the potential for use of binocular contrast sensitivity testing as an objective measure for severity of deviation for intermittent exotropia patients.

Binocular contrast sensitivity in patients with intermittent exotropia in relation to angle of strabismus and level of compensation.
Moradi F, Mirzajani A, Akbari MR, et al.
STRABISMUS
2023;31(1):1-8.
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Fiona Rowe (Prof)
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Fiona Rowe (Prof)

Institute of Population Health, University of Liverpool, UK.

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