Modulation of Sensory Photophobia in Essential Blepharospasm with Chromatic Lenses

Blepharospasm patients tolerate a lower intensity of light when compared with normal subjects; this differential in light tolerance becomes significantly more pronounced as the higher wavelengths of the visible spectrum are blocked. The symptoms of photophobia in blepharospasm patients can be reduced significantly with photochromatic modulation. Despite lens 6 allowing the patients to tolerate a higher intensity of light, the majority of patients preferred lens 7 for symptomatic relief of photophobia. These findings suggest that sensory photophobia may be related more to the wavelength than to the intensity of the light exposure.