Symptom Information: Sort according to HPO 

1
(HPO:0000505) Visual impairment 17033974 IBIS 297 / 7739
2
(HPO:0007984) Reduced amplitude of dark-adapted bright flash electroretinogram b-wave 17033974 IBIS 3 / 7739
3
(HPO:0000007) Autosomal recessive inheritance 2538 / 7739