Fluorescein permits us To guage the physical in shape of the Call lens, or the bearing romance that exists concerning a transparent Speak to lens and the eye. A yellow-environmentally friendly glow indicates the existence of fluorescein and as a consequence clearance concerning the lens and cornea. S⁣p⁣F⁣C⁣o⁣n⁣s⁣ ⁣o⁣r⁣e⁣thr