This is a preview. Log in through your library . Abstract The chromophore of visual pigments is 11-cis-retinal and, thus, in its absence, opsin is not photosensitive and no visual function exists.

Luz Marina Rojas, Raymond McNeil, Thérése Cabana and Pierre Lachapelle We compared the diurnal and nocturnal visual function in two tactile foraging waterbird species, the red subspecies of the ...

To describe the effects of vitamin A deficiency (VAD) on retinal function and the subsequent recovery following treatment in three patients with systemic conditions (two with Crohn disease; one ...