Table 1. Clinical features of the patients from the three Chinese families with Usher syndrome type II.
| Family number | Patient | Best corrected visual acuity (R/L) | Onset age of night blindness (year) | Fundus appearance | Onset age of hearing loss (year) | Hearing impairment | ERG | Vestibular function |
|---|---|---|---|---|---|---|---|---|
| F3 |
73021 |
FC/PL |
14 |
RP |
10 |
Moderate (SP) |
Wave undetectable |
Normal |
| F4 |
73034 |
0.3/0.2 |
15 |
RP |
congenital |
Moderate (SP) |
N/A |
Normal |
| 73036 |
FC/ PL |
14 |
RP |
congenital |
Severe (SP) |
Wave undetectable |
Normal |
|
| F5 |
73041 |
HM/HM |
14 |
RP |
congenital |
Severe (SP) |
Wave undetectable |
Normal |
| 73045 |
HM/HM |
10 |
RP |
congenital |
Severe (SP) |
N/A |
Normal |
|
| 73046 | 0.1/0.1 | 14 | RP | congenital | Moderate (SP) | N/A | Normal |
Abbreviations: R, right eye; L, left eye; FC, finger counting; PL, perception of light; HM, hand motion; SP, slight progressive; N/A, data not available.