ABSTRACT
The aim of this study was to find whether the visual evoked potential [VEP] latencies and amplitude are altered with different visual angles in healthy adult volunteers or not and to determine the visual angle which is the optimum and most appropriate among a wide range of check sizes for the reliable interpretation of pattern reversal VEPs [PRVEPs]. The present study was conducted on 40 healthy volunteers. The subjects were divided into two groups. One group consisted of 20 individuals [nine males and 11 females] in the age range of 25-57 years and they were exposed to checks subtending a visual angle of 90, 120, and 180 minutes of arc. Another group comprised of 20 individuals [10 males and 10 females] in the age range of 36-60 years and they were subjected to checks subtending a visual angle of 15, 30, and 120 minutes of arc. The stimulus configuration comprised of the transient pattern reversal method in which a black and white checker board is generated [full field] on a VEP Monitor by an Evoked Potential Recorder [RMS EMG. EPMARK 11]. The statistical analysis was done by One Way Analysis of Variance [ANOVA] using EP1 INFO 6. In Group I, the maximum [max.] PI00 latency of 98.8 +/- 4.7 and the max. P100 amplitude of 10.05 +/- 3.1 microV was obtained with checks of 90 minutes. In Group II, the max. PI00 latency of 105.19 +/- 4.75 msec as well as the max. P100 amplitude of 8.23 +/- 3.30 microV was obtained with 15 minutes. The min. PI00 latency in both the groups was obtained with checks of 120 minutes while the min. PI00 amplitude was obtained with 180 minutes. A statistically significant difference was derived between means of PI00 latency for 15 and 30 minutes with reference to its value for 120 minutes and between the mean value of P100 amplitude for 120 minutes and that of 90 and 180 minutes. Altering the size of stimulus [visual angle] has an effect on the PRVEP parameters. Our study found that the 120 is the appropriate [and optimal] check size that can be used for accurate interpretation of PRVEPs. This will help in better assessment of the optic nerve function and integrity of anterior visual pathways
ABSTRACT
Introduction: Considering the rising intellect of students and the developing scientific temper among undergraduates the concept of seminars was introduced to first year MBBS students. The innovative approach (concept of seminar) for the learning of first year medical subjects needs to be evaluated periodically. A questionnaire was designed to obtain feedback from students. Methods: First year medical students were given a questionnaire comprising of eleven questions. Results: The views obtained by students were calculated as percentage and discussed. Conclusion: The majority of students has considered it to be good method of self-learning and were in support of continuation of such a system in forthcoming years.
ABSTRACT
Abstract not available