Researchers at the Keio University School of Medicine in Japan have investigated the effect of luminance on refraction and visual function under twilight conditions.
A study compared differences between measurements among 20 young adults that were taken in two settings with different luminance.
The study participants had examinations of subjective and objective spherical equivalent power, logMAR, pupil diameter, ocular aberration, and ocular axial length. Measurements were taken in a light room with high luminance targets, in a dark room with low luminance targets, and a dark room after 15 minutes of adaptation to low luminance targets.
Researchers concluded that refractive and visual function changed in twilight conditions, with an increase in subjective myopic refraction found as well as a decrease in visual resolution in younger subjects. However, the change in refraction was less than ±0.25 D, so researchers said fully corrected spectacles were important when assuming refraction in twilight, and there was no need for additional correction.
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