Visual evoked potentials after panretinal photocoagulation in patients with proliferative diabetic retinopathy

Figures & data

Table 1 The mean and standard deviation of PRVEP before and after the treatment of panretinal photocoagulation (PRP)

Visual evoked potential components	Session	Study Group	P-value
P100 Amplitude (µv)	Pre	9.30±1.34	<0.001
	First	8.61±1.35	<0.001
	Second	8.09±1.44	<0.001
	Third	7.59±1.54	<0.001
	1.5 months	8.05±1.37	<0.001
P100 Latency (ms)	Pre	108.40±6.45	<0.001
	First	111.24±5.82	<0.001
	Second	114.14±5.74	<0.001
	Third	117.87±6.42	<0.001
	1.5 months	115.89±6.49	<0.001

Table 2 % mean differences of PRVEP components groups in different paired sessions

Visual evoked potential components	Paired Session	Mean differences in study group (%)	Study group P-value
P100 Amplitude (µv)	Pre-First	−7.57±3.06	<0.001
	First-Second	−6.28±3.44	<0.001
	Second-Third	−6.53±3.75	<0.001
	Third-1.5 M	6.79±5.20	<0.001
	First-1.5 M	−13.63±5.47	<0.001
P100 Latency (ms)	Pre-First	2.67±1.96	<0.001
	First-Second	2.62±1.05	<0.001
	Second-Third	3.27±1.79	<0.001
	Third-1.5 M	−1.67±1.25	<0.001
	First-1.5 M	6.98±3.05	<0.001

Abbreviations: PRVEP, pattern-reversal visual evoked potentials; μv, microvolt; ms, millisecond; M, Months.