GUCA1A and Photophobia: The gene coding for GCAP1, named GUCA1A, has been associated with autosomal dominant cone dystrophies (adCOD) [11,12,13,14,15,16,17,18,19,20,21,22,23,24,25], a class of severe retinal degeneration diseases characterized by central vision loss, impaired color vision, and photophobia [26].