includes a wide range of functions such as hormone secretion, alertness, mood etc. The non-
image forming effects occur because light affects melanopsin, a photosensitive protein
present in the receptive domain of retinal ganglion cells. These cells are responsible for
generating nerve impulses that regulate the secretion of two hormones, cortisol and
melatonin. Low-wavelength light at 460-480 nm inhibits melatonin secretion and activates …