Table 2.
— = no information; ERG = electroretinogram; HC = head circumference; MR = mental retardation; NVIQ = nonverbal IQ; SEP =sensory-evoked potentials; VEP = visual-evoked potentials.
— = no information; ERG = electroretinogram; HC = head circumference; MR = mental retardation; NVIQ = nonverbal IQ; SEP =sensory-evoked potentials; VEP = visual-evoked potentials.