“…The full-field ERG may have reduced amplitude, initially in the scotopic component only, or be extinct [ 83 , 85 ]. Children under 7 years have rarely been diagnosed [ 82 , 84 , 85 ]. In our case, considering the initial alterations of the fundus as early as 4 years, the presence of areas of chorioretinal atrophy at 6 years, and an altered ERG at 5 years, which presented an initial involvement of the retinal cones, the ophthalmologic involvement is to be considered very serious with probable poor outcome and early visual loss.…”