Abstract
Circadian effect on steady-state pupil size is time of a day dependent
Highlights
A number of studies have been conducted to develop the mechanism and equations between pupil size and luminance [1,2]
The discovery of a new class of photosensitive cells in the retina, the intrinsically photosensitive retinal ganglion cells, which send retinal information induced by ambient light to the brain center to partly control the physiological characteristics of human, the pupil size, leads researchers to explore how the ipRGCs react under different luminance conditions
The pupil diameters at different time of a day were measured to deduce the relationship between cirtopic effect on pupil size and time of a day
Summary
A number of studies have been conducted to develop the mechanism and equations between pupil size and luminance [1,2]. It is evidenced that the pupil size, an important factor of visual performance, is influenced by this cirtopic effect [3,4]. All past investigations of cirtopic effect on pupil size were conducted at a certain time of the day by researchers [5,6].
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