Flash Electroretinography and Pattern Visual Evoked Potential Changes in Ocular Hypertension Patients

Table 4

fERG findings.

Parameter	Study group	Control group	𝑡	𝑃
Maximal rod-cone response
Latency (ms)
A	18.5 ± 1.0	17.0 ± 0.8	0.430	0.65
B	42.0 ± 0.8	39.0 ± 0.4	0.395	0.72
Amplitude (μV)
A	122 ± 4.0	125 ± 3.5	0.705	0.52
B	190 ± 5.2	193 ± 5.8	0.500	0.65
Rod response
Latency (ms)
A	22.4 ± 6.0	19.7 ± 5.3	0.504	0.49
B	75.0 ± 5.6	71.0 ± 4.2	0.420	0.62
Amplitude (μV)
A	4.7 ± 3.1	4.8 ± 1.6	1.245	0.38
B	85.0 ± 2.5	83.5 ± 2.0	1.300	0.26
Cone response
Latency (ms)
A	18.8 ± 0.9	15.3 ± 1.5	0.705	0.54
B	33.0 ± 0.2	31.0 ± 0.1	0.525	0.45
Amplitude (μV)
A	19.0 ± 4.9	19.0 ± 3.4	0.497	0.60
B	70.5 ± 0.4	69.0 ± 0.2	0.350	0.28
Flicker response (30 Hz)
Latency (ms)	29.1 ± 3.0	25.2 ± 2.1	3.330	0.10
Amplitude (μV)	61.2 ± 19.1	60.5 ± 11.0	0.028	0.99
Oscillatory potentials (OPs)
Latency (ms)
P1 (OPs 1)	17.0 ± 0.9	15.0 ± 1.2	0.595	0.57
P2 (OPs 2)	24.1 ± 0.1	22.2 ± 0.2	0.514	0.45
P3 (OPs 3)	33.5 ± 0.2	33.0 ± 0.1	0.485	0.15
P4 (OPs 4)	44.2 ± 0.8	40.2 ± 0.6	0.750	0.75
Amplitude (μV)
P1 (OPs 1)	12.9 ± 5.8	23.3 ± 6.1	2.225	0.02
P2 (OPs 2)	38.2 ± 1.5	40.3 ± 3.2	0.250	0.35
P3 (OPs 3)	3.9 ± 0.2	4.1 ± 0.1	0.310	0.42
P4 (OPs 4)	4.8 ± 0.5	5.1 ± 0.4	0.540	0.24

fERG: flash electroretinogram, ms: millisecond, μV: millivolt, OPs: oscillatory potentials, P1–4: oscillatory potential measurements, 𝑡: time, 𝑃: 𝑃 value.