SR55

Type 2 Usher Syndrome (IB1b)

Female

Female

SR55

Type 2 Usher Syndrome (IB1b)

Female

Female

Highlighted Images

Age at visit: 48 years
OD OS

History

This 48 year old woman began wearing hearing aids at age 6. As a young child, her best corrected visual acuity was completely normal. She had no difficulties with her vision until her late 20's when she began having some difficulties in dim light and some reduction of her peripheral vision.

Refraction OD:     +0.75 +1.00 x 36 (pseudophakic)
Refraction OS:     0.25 +1.00 x 142 (pseudophakic)

Pedigree

Teaching Points

The clinical features supporting the diagnosis of type 2 Usher syndrome in this patient include: childhood onset hearing loss correctable with hearing aids; night blindness and constricted visual fields as her earliest visual symptoms; bone-spicule-like pigmentation and narrowed arterioles on fundus examination; loss of outer retinal structures on OCT; and, normally sighted parents.

Age at visit: 48 years
Age at visit: 49 years
Age at visit: 50 years
Age at visit: 53 years
Age at visit: 55 years
Age at visit: 59 years

Diagnosis & molecular findings

Disease Gene Allele 1 variant(s) Allele 2 variant(s) Inheritance mode
Type 2 Usher Syndrome USH2A Asn346His AAT>CAT Gly1734Cys GGT>TGT AR
Gene:
Allele 1:
Asn346His AAT>CAT
Allele 2:
Gly1734Cys GGT>TGT
Inheritance:
AR
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