Visual acuity evaluated by pattern-reversal visual-evoked potential is affected by check size/visual angle

Objective To systemically explore the range of visual angles that affect visual acuity, and to establish the relationship between the P 1 component （peak latency -100 ms） of the pattern-reversal visual-evoked potential （PRVEP） and the visual acuity at particular visual angles. Methods Two hundred an...

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Bibliographic Details
Published in:Neuroscience bulletin 2012-12, Vol.28 (6), p.737-745
Main Authors: Chen, Xiping, Li, Qianqian, Liu, Xiaoqin, Yang, Li, Xia, Wentao, Tao, Luyang
Format: Article
Language:English
Subjects:
Adolescent
Adult
Anatomy
Anesthesiology
Biomedical and Life Sciences
Biomedicine
COM组件
Data Interpretation, Statistical
Electroencephalography
Evoked Potentials, Visual - physiology
Female
Human Physiology
Humans
Linear Models
Male
Neurology
Neurosciences
Original
Original Article
Pain Medicine
Pattern Recognition, Visual - physiology
Photic Stimulation
Sex Characteristics
Vision Disparity - physiology
Vision Tests
Visual Acuity - physiology
Visual Pathways
Young Adult
可视角度
检查
潜伏期
翻转
视力
视觉诱发电位
评估标准
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Summary:Objective To systemically explore the range of visual angles that affect visual acuity, and to establish the relationship between the P 1 component （peak latency -100 ms） of the pattern-reversal visual-evoked potential （PRVEP） and the visual acuity at particular visual angles. Methods Two hundred and ten volunteers were divided into seven groups, according to visual acuity as assessed by the standard logarithmic visual acuity chart （SLD-II）. For each group, the PRVEP components were elicited in response to visual angle presentations at 8°, 4°, 2°, 1°/60＇, 30＇, 15＇, and 7.5＇, in the whiteblack chess-board reversal mode with a contrast level of 100% at a frequency of 2 Hz. Visual stimuli were presented monocularly, and 200 presentations were averaged for each block of trials. The early and stable component P1 was recorded at the mid-line of the occipital region （Oz） and analyzed with SPSS 13.00. Results （1） Oz had the maximum Pl amplitude; there was no significant difference between genders or for interocular comparison in normal controls and subjects with optic myopia. （2） The P1 latency decreased slowly below 30＇, then increased rapidly. The P1 amplitude initially increased with check size, and was maximal at -1° and -30＇. （3） The P1 latency in the group with visual acuity 〈0.2 was signifi- cantly different at 8°, 15＇ and 7.5＇, while the amplitude differed at all visual angles, compared with the group with normal vision. Differences in P1 for the groups with 0.5 and 0.6 acuity were only present at visual angles 〈1°. （4） Regression analysis showed that the P1 latency and amplitude were associated with visual acuity over the full range of visual angles. There was a moderate correlation at visual angles 〈30＇. Regression equations were calculated for the P1 components and visual acuity, based on visual angle. Conclusion （1） Visual angle should be taken into consideration when exploring the function of the visual pathway, especially visual acuity. A visual angle -60＇ might be appropriate when using PRVEP com- ponents to evaluate poor vision and to identify malingerers. （2） Increased P1 amplitude and decreased P1 latency were as- sociated with increasing visual acuity, and the P1 components displayed a linear correlation with visual acuity, especially in the range of optimal visual angles. Visual acuity can be deduced from P 1 based on visual angle.
ISSN:1673-7067
1995-8218
DOI:10.1007/s12264-012-1292-9