| Normal values of Positive wave in the Multifocal Electroretinography in Korean. |
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Young Dal Lee, Sun Ryang Bae |
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Department of Ophthalmology, Daejeon St. Mary's Hospital, The Catholic University of Korea, College of Medicine, Korea. sunrbae@yahoo.com |
| 한국인의 다초점 망막전위도 양성파의 정상치 |
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이영달 ( Young Dal Lee ) , 배선량 ( Sun Ryang Bae ) |
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| Abstract |
PURPOSE
To obtain normal values of positive wave (b-wave) in the multifocal ERG in terms of age and sex of Koreans. METHODS: The multifocal ERGs by using RETIscan visual evoked response imaging system were tested for 80 eyes. 61 retinal locations were stimulated concurrently. We analyzed the average responses of 5 concentric rings. RESULTS: In the amplitudes of b-wave, ring 1, 84.1 5.4 nV/deg, was the largest of all the other rings and ring 5, 23.1+/-1.5 nV/deg, was the smallest of all the other rings (P<0.05). No statistically significant difference was observed in amplitude between sexs. The implicit time of b-wave was the longest in the ring 1, 40.8 1.6 ms, and shortest in the ring 4, 36.7+/-0.9 ms (P<0.05). CONCLUSIONS: The amplitude of b-wave was the largest in the fovea, and became smaller with eccentricity. The largest amplitude of b-wave was observed in the age of twenties. The amplitude of b-wave was decreased with age in the ring 3, 4, and 5. The interindividual variation of the amplitude of b-wave was greatest in the fovea. The implicit time of b-wave in the fovea was the longest, and that in the ring 4 was the shortest. It became longer from the ring 5, again. |
| Key Words:
Amplitude;Implicit time;Multifocal ERG;Positive (b) wave |
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