The variability of parameters of multi-focal electroretinogram
- VernacularTitle:多焦视网膜电图各项参数的变异性
- Author:
Jinghua CHEN
;
Xiaoxin LI
;
Xiulan XU
- Publication Type:Journal Article
- Keywords:
Electroretinography;
Retinal diseases/diagnosis;
Reference values
- From:
Chinese Journal of Ocular Fundus Diseases
2000;0(04):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the variability of four parameters of multi-focal electroretinogram (mERG) a-wave amplitude, b-wave amplitude, a-wave latent period, b-wave latent period. Methods Sixty normal eyes of 46 volunteers were divided into 3 groups of different ages. RETIscan 3 12 system was used to carry out mERG examination. The stimulus matrix of 61 hexagonal elements spanning the central 24?of the visual field. These hexons were scaled with eccentricity and divided into 5 rings. First-order kernel was selected. Results The variability of four parameters of mERG was great. The variability of b-wave latent period was the smallest, its coefficient of variatian was 4.52%～15.62%;that of a-wave latent period held the second place:10.29%~48.67%;that of b-wave amplitude was greater:25.92%~76.11%;that of a-wave amplitude was the greatest:43.82%~88.23%. The results of three groups showed that b-wave amplitude of ring 1 had the smallest variability. Conclusions The variability of latent period is smaller than that of amplitude; the variability of b-wave was smaller than that of a-wave. The longer the centrifugal distance, the lower the amplitude density of a-wave and b-wave. Physiological and anatomical factors might be important for the variability of parameters of multi-focal electroretinogram.
