Psychomotor deterioration becomes evident in the early school years, and seizures start at a mean age of 10 years.
[pediatricneurologybriefs.com]
deterioration 0002361 Psychosis 0000709 Rod-cone dystrophy 0000510 Seizures Seizure 0001250 Undetectable electroretinogram 0000550 Vacuolated lymphocytes 0001922 Showing
[rarediseases.info.nih.gov]
It is characterized by rapid deterioration with psychomotor retardation, loss of speech, seizures, ataxia, blindness, hypotonia, microcephaly, and occasional convulsions.
[icd10data.com]