Photophobia Assay.

(A) The imaging setup. CT = Camera mounted on tripod. W = LED wand. D = Testing dish. C1/C2 = Clamps. B = Battery pack. R = Ring stand. (B) Close-up of testing dish. (B1) The labeled guide placed underneath the dish marks the 4 quadrants (Q1–Q4) and the semi-circle where the LED light will be directed. (B2) Image of testing dish during a trial, showing the resulting light-to dark gradient. (C) The spectral composition of the LEDs used, and their location on the electromagnetic spectrum. UV = Ultraviolet. IR = Infrared.