Symptom Information: Sort according to HPO 

	Symptom Information	Symptom	Abundance	Frequency	Pubmed	Source	DB Freq
1	(HPO:0000505)	Visual impairment			17546029	IBIS	297 / 7739
2	(HPO:0000540)	Hypermetropia			17546029	IBIS	99 / 7739
3	(HPO:0000550)	Undetectable electroretinogram			17546029	IBIS	25 / 7739
4	(HPO:0000639)	Nystagmus			17546029	IBIS	555 / 7739
5	(HPO:0000007)	Autosomal recessive inheritance					2538 / 7739