Axial Length in Patients with Myopia and Interpretation of Pattern Electroretinogram Recordings

Figures & data

Table 1 Basic Parameters of the Analyzed Subjects

Parameter	Controls ± 1.00 D	Moderate Myopia −3.00 to −6.00 D	High Myopia <–6.00 D	F	P
Age	28.9±0.99	28.85±0.99	29.1±0.99	0.02	0.98
Body height (m)	1.74±0.03	1.67±0.03	1.67±0.03	1.75	0.18
Body weight (kg)	66.7±3.21	62.2±2.08	67.7±4.28	0.78	0.46
BMI	21.69±3.45	22.11±2.64	22.56±4.18	0.31	0.73
SBP	117.75±14.06	121.2±12.70	121.95±17.93	0.44	0.65
DBP	73.25±8.27	73.80±10.22	75.80±13.31	0.30	0.74
HR	68.65±9.26	68.70±10.60	71.95±7.84	0.83	0.44

Notes: Values in the table are means ±standard deviation.

Abbreviations: BMI, body mass index, SBP, systolic blood pressure, DBP, diastolic blood pressure, HR, heart rate.

Figure 1 PERG-traces representative for individuals of the particular group.

Table 2 Parameters Measured in Analyzed Groups

Parameter	Controls ±1.00 D	Moderate Myopia −3.00 to −6.00 D	High Myopia <–6.00 D	F	P
BCVA	−0.134±0.11	−0.142±0.22	−0.005±0.16	4.06	0.02
Spherical error	0.125±0.48	−4.395±0.93	−7.637±1.71	226.85	<0.001
Cylindrical error	−0.21±0.28	−0.41±0.44	−0.95±0.81	9.20	0.003
SE	0.03±0.53	−4.65±0.91	−8.16±0.42	219.00	<0.001
IOP	14.82±2.68	17.01±1.78	16.80±3.19	4.27	0.02
AL	23.27±0.78	25.17±0.70	26.45±1.37	51.62	<0.001
P50 peak time (ms)	49.85±2.17	52.12±2.25	52.84±3.16	7.38	0.001
P50 amplitude	5.52±1.85	4.77±2.01	3.71±1.33	5.37	0.01
N95 amplitude	7.89±2.44	6.92±2.77	5.36±1.90	5.69	0.01
N95/P50 ratio	1.48±0.22	1.48±0.31	1.46±0.26	0.04	0.96

Notes: Values in the table are means ± standard deviation.

Abbreviations: BCVA, best corrected visual acuity; SE, spherical equivalent of refractive error; IOP, intraocular pressure; AL, axial length.

Figure 2 (A) Correlation of P50 amplitude and AL. (B) Correlation of N95 amplitude and AL. (C) Correlation of P50 implicit time and AL, (D) Correlation between spherical equivalent of refractive error and P50 and N95 amplitude and P50 implicit time.

Abbreviations: AL, axial length; SE, spherical equivalent of refractive error; P, level of significance; r, coefficient of correlation.