Comparison of objective assessment using the sweep pattern visual evoked response acuity (SPVERA) and illiterate E visual acuity / 法医学杂志
Journal of Forensic Medicine
;
(6): 342-345, 2006.
Article
in Chinese
| WPRIM
| ID: wpr-983219
ABSTRACT
OBJECTIVE@#To compare the vision objectively assessed by SPVERA with the illiterate E Acuity in normal subjects.@*METHODS@#The effect of artificially induced image defocusing on visual acuities (Vas) measured by SPVEP and illiterate E chart measurement was studied in 14 normal subjects. SPVEP was recorded using vertical gratings of 8 different spatial frequencies ranging from 0.235 9 to 30.203 2 c/deg. The responses were averaged and displayed through the discrete Fourier transform on the monitor display. SPVERA was determined by extrapolating the PVER amplitude -spatial frequency function to baseline. SPVERA was compared with illiterate E visual acuity measured under the same conditions of optical defocus.@*RESULTS@#With moderate defocusing (<+1.0 diopter (D),VA > 0.42), the SPVERA were equal to or poorer than the illiterate E visual acuity. With more defocus (> +2.0 diopter (D), VA < 0.3),the SPVERA became better than the illiterate E chart Visual Acuity. The correlation between the two acuities was r2 = 0.919.@*CONCLUSION@#SPVERA and the illiterate E visual acuity correlated to a certain degree. We conclude that the SPVERA is effective in estimating vision objectively.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Pattern Recognition, Visual
/
Photic Stimulation
/
Vision Disorders
/
Vision Tests
/
Visual Acuity
/
Evoked Potentials, Visual
/
Fourier Analysis
Limits:
Adult
/
Female
/
Humans
/
Male
Language:
Chinese
Journal:
Journal of Forensic Medicine
Year:
2006
Type:
Article
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