Bum G Kim1, In B Chang2, Kyeong D Jeong3, Jae Y Park1, Jae S Kim1, Je Hyung Hwang4. 1. Department of Ophthalmology, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea. 2. Department of Ophthalmology, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea. 3. Asan-si Healthcare Center, Asan-si, Chungcheongnam-do, Korea. 4. Department of Ophthalmology, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea. violentviolet15@daum.net.
Abstract
PURPOSE: To compare full-field electroretinography (ffERG) parameters obtained from handheld and tabletop electroretinography (ERG) devices in normal subjects. METHODS: Twenty volunteers underwent ffERG using a tabletop and handheld stimulator. The responses obtained from the right eyes were compared. The coefficient of variation and intraclass correlation coefficient (ICC) were derived to assess inter- and intra-individual reliability. RESULTS: The b-wave in the rod response, a- and b-waves in the maximal combined response, a-wave in the cone response, and the 30-Hz flicker response showed significantly greater amplitudes when recorded with the tabletop stimulator than with the handheld stimulator. The implicit time of response (ITR) in the 30-Hz flicker response was longer when recorded with the handheld stimulator than when recorded with the tabletop stimulator. With regard to amplitude, the ICC indicated moderate-to-high reliability in the measurement of the b-wave in the rod response, and a- and b-waves in the maximal combined response. With regard to ITR, measurement of the b-wave in the rod response and a-wave in the maximal combined response showed moderate-to-high reliability. CONCLUSION: Despite the significantly lower ERG amplitude measurements recorded by the handheld stimulator, there were no significant differences in variability between the two stimulators.
PURPOSE: To compare full-field electroretinography (ffERG) parameters obtained from handheld and tabletop electroretinography (ERG) devices in normal subjects. METHODS: Twenty volunteers underwent ffERG using a tabletop and handheld stimulator. The responses obtained from the right eyes were compared. The coefficient of variation and intraclass correlation coefficient (ICC) were derived to assess inter- and intra-individual reliability. RESULTS: The b-wave in the rod response, a- and b-waves in the maximal combined response, a-wave in the cone response, and the 30-Hz flicker response showed significantly greater amplitudes when recorded with the tabletop stimulator than with the handheld stimulator. The implicit time of response (ITR) in the 30-Hz flicker response was longer when recorded with the handheld stimulator than when recorded with the tabletop stimulator. With regard to amplitude, the ICC indicated moderate-to-high reliability in the measurement of the b-wave in the rod response, and a- and b-waves in the maximal combined response. With regard to ITR, measurement of the b-wave in the rod response and a-wave in the maximal combined response showed moderate-to-high reliability. CONCLUSION: Despite the significantly lower ERG amplitude measurements recorded by the handheld stimulator, there were no significant differences in variability between the two stimulators.
Keywords:
Full-field electroretinography; Handheld stimulator; Normal subjects; Tabletop stimulator
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