Evaluation of visual function in amblyopia by visual evoked potential usint real time spectrum analyzer

1993 Fiscal Year Final Research Report Summary

• Project/Area Number: 03670840
• Research Category: Grant-in-Aid for General Scientific Research (C)
• Allocation Type: Single-year Grants
• Research Field: Ophthalmology
• Research Institution: University of Occupational and Environmental Health, Japan
• Principal Investigator: HAMADA Tsunekazu UOEH, Dept Ophthalmol., Assistant Professor, 医学部, 講師 (20138077)
• Co-Investigator(Kenkyū-buntansha): AKIYA Shinobu UOEH, Dept Ophtalmol., Professor, 医学部, 教授 (10051286)
• Project Period (FY): 1991 – 1993
• Keywords: visual evoked potential / real time spectrum analyzer / anisometropic amblyopia / temporal frequency / fast furier transformation / steady state VEP

Research Abstract

We evaluated visual function in amblypia by visual evoked potential using real time spectrum analyzer.
We studied 15 anisometropic amblyopes ranging in age from 4 to 10 years. We exmamined them by means of pattern reversal VEP before treatment. VEP was performed with five different temporal frequencies, 10, 12, 14, 16, and 20Hz where it is usually more stable than the transient VEP.Contrast was 80%, stimulus check size was 10 minutes of arc, mean luminance was 50cd/m^2 and the stimulus field was 28ﾟ X 22ﾟ. We analyzed the data by means of FFT method. The effect of temoral variation for pattern reversal VEP was studied. The most significant reduction in amplitude of the amblyopic eye when compared with nonamblyopic eye occured at the temporal frequency of 10Hz and was not so significant at higher temporal frequencies. It was worthwhile to evaluate visual function in amblypia by visual evoked potential using real time spectrum analyzer.