Study does Investigation of TEC evoked with bright light in
This study aimed to present a simple method for evaluating transient eye closure (TEC) evoked by bright light and find the agreement between TEC and photosensitivity. Researchers assessed the associated factors with TEC in the patients with intermittent exotropia (IXT).

In this retrospective study, IXT patients were exposed to different brightness: darkness, low-intensity white light, and high-intensity white light using a near-infrared camera vision monitor system. Researchers assessed the presence of photosensitivity using a questionnaire and evaluated the agreement between TEC and photosensitivity & investigated the sensory fusion, motor fusion, and pupil dynamic components for the existence of TEC in IXT patients.

Results:
--61 patients with IXT were included. With the new method to evaluate TEC under different light intensities, 27 of the 61 IXT patients showed TEC, and 34 did not demonstrate TEC.

--TEC under high-intensity white light had a strong correlation with self-reporting photosensitivity.

--The smaller angle of deviation at near was associated with the presence of TEC, with statistical significance.

--Normal sensory status at a distance was significantly associated with TEC.

--Multivariate analysis using multiple logistic regression analysis showed that normal sensory status was significantly associated with TEC.

In particular, the test using a near-infrared camera vision monitor system was a simple and objective tool in identifying TEC evoked by bright light. The presence of TEC strongly correlated with self-reporting photosensitivity in patients with IXT. However, TEC may be an independent phenomenon with motor alignment, stereopsis, and pupil reflex pathway in patients with IXT.

Source: https://bmcophthalmol.biomedcentral.com/articles/10.1186/s12886-021-02046-7
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