Disclosed is an agent for inhibiting or reducing light sensitivity comprising a substance that inhibits or reduces ubiquitination, for example, an agent for inhibiting or reducing light sensitivity capable of protecting a retina, reducing retinal degeneration, reducing aging of a retina and/or reducing hyperesthesia. The present invention is suitable for use in amelioration or prevention of a symptom associated with light reception, such as age-related macular degeneration, retinitis pigmentosa, Leber congenital amaurosis, Stargardt disease, cone-rod dystrophy, diabetic retinopathy, macular edema, retinal ischemia, photosensitive seizure, photosensitive epilepsy, psychiatric disorders, photic maculopathy, asthenopia, retinal dysfunction, sleep disorders, migraine and light-induced damage.
