Table I.

Summary of clinical data for some members in the Chinese pedigree

Patient	sex	Age of test (yrs)	Age of onset (yrs)	Visual acuity right	Visual acuity left	Level of visual impairment
II-7	F	70	-	0.4	0.6	normal
III-2	F	65	-	0.7	0.9	normal
III-4	F	62	45	<0.01	<0.01	profound
III-7	M	55	-	0.8	0.6	normal
III-9	F	54	27	<0.01	<0.01	profound
III-10	M	50	-	1.0	1.0	normal
III-12	F	37	-	1.0	1.0	normal
III-14	F	50	-	0.8	0.9	normal
III-15	M	41	-	0.9	1.2	normal
III-17	F	38	-	1.0	1.2	normal
III-18	M	35	15	<0.01	<0.01	profound
IV-1	M	40	18	0.5	0.1	mild
IV-2	M	38	-	1.2	1.2	normal
IV-3	M	33	17	0.06	0.1	moderate
IV-4	M	33	-	0.8	1.0	normal
IV-5	M	43	8	0.1	0.1	mild
IV-6	M	40	20	0.01	0.01	profound
IV-7	F	36	-	0.9	1.0	normal
IV-8	F	33	10	0.12	0.2	mild
IV-9	M	29	17	0.03	0.05	severe
IV-10	F	26	-	0.8	0.7	normal
IV-11	M	11	-	1.0	1.0	normal
IV-12	M	28	6	<0.01	<0.01	profound
IV-13	F	26	-	1.0	1.0	normal
IV-14	M	11	-	0.8	1	normal