Besides VA, all phenotypic characteristics in OCA1, OCA2, and OA1 were more variable than in FHONDA in this study: 11% (14/132) of patients with albinism did not have nystagmus (0% in FHONDA), foveal hypoplasia varied from grades 1 to 4 (only grade 4 in FHONDA), and misrouting was absent in 22% (16/74, 0% in FHONDA; see also Fig. 4) Misrouting was more evident in FHONDA, and was detected with all stimulus types (i.e. pattern onset and flash VEP), regardless of age. The gene discussed is OCA2; the disease is pathologic nystagmus.