Table 1

A summary of ERG results in 17 patients with helicoidal peripapillary chorioretinal degeneration

Patient no		Age				Scotopic b-wave (μV)		Mixed rod/cone b-wave (μV)			Implicit times (ms)
				Acuity							Mixed rod/cone		Scotopic
				Left eye	Right eye						b-wave	a-wave	a-wave
1	29	20/20	20/15	230	316	90	2.5	33	22	28
2	38	20/60	20/400	150	170	50	2.21	44	26	32
3	21	20/20	20/20	391	406	90	2.3	34	23	28
4	71	CF	20/70	187	231	42	2.3	46	30	35
5	79	20/120	CF	161	169	24	2.35	48	32	35
6	81	20/80	20/200	191	234	5	2.12	40	29	35
7	55	20/20	20/20	291	281	86	3.57	42	24	31
8	26	20/20	20/20	247	228	78	2.38	37	27	30
9	24	20/20	20/200	303	394	78	2.02	36	25	30
10	70	20/40	20/40	275	331	94	2.25	40	28	34
11	46	20/20	20/20	309	268	75	1.93	36	24	29
12	53	20/30	20/30	272	284	68	2.1	36	27	31
13	70	20/120	20/120	122	109	69	2.8	38	29	31
14	42	20/80	20/80	150	172	63	2.07	46	29	34
15	29	20/200	20/200	231	250	11	1.95	32	22	31
16	50	20/20	20/20	319	375	72	2.45	39	25	31
17	51	20/20	20/20	144	244	31	2.1	40	24	30
Patient mean				233	262	60	2.33	39.2	24	29
SD				76	83	28	0.38	4.72	2.71	1.41
Normal range (μV)				200–456	340–680	82–125	2.05–2.75
Normal mean (μV)				342	437	98	2.33	39	22.9	2.8
SD				69	97	13	0.22	4.6	0.87	1.3

↵The flicker response was evoked with a repetition rate of 31 Hz at maximum intensity (−0.19 log cd.s/m²), the scotopic b-wave at the maximum intensity used for eliciting rod responses (−1.22 log cd.s/m²), and the mixed rod-cone b-wave at −0.27 log cd.s/m² intensity.

Helicoidal peripapillary chorioretinal degeneration: electrophysiology and psychophysics in 17 patients

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