GUCA1A and Photophobia: To date, more than twenty point mutations identified in GUCA1A, the gene coding for GCAP1, have been associated with various forms of autosomal dominant cone dystrophies (adCOD) [10,11,12,13,14,15,16,17,18,19,20,21,22,23,24], a class of severe retinal degeneration diseases characterized by central vision loss, impaired color vision, and photophobia [25].