vitamin a (retinol) – isometric view 3d

xerophthalmia vitamin vision undefined ulceration system soluble sight scotopic rod rhodopsin retinol protein precursor opsin ocular night lymphatic lumen liver lipid light immune hepatocytes hepatic healthy growth foods fat eye enzymes enterocytes embryology embryo dry droplets daylight dark corneal cone color chylomicrons carotenoid carotene cardiovascular blood beta acid absorbing