Examines how accommodation affects amplitude and timing in visually evoked responses, suggesting caution in clinical evaluations.
Accommodation causes variation in both visually evoked response (VER) amplitude and implicit time. Measurements indicate an average decrease in amplitude of about 1 μ V per diopter and an increase in implicit time of about 1.5 msec per diopter for increasing amounts of accommodation. Care should be taken to eliminate any accommodative stimulus which could alter the normal VER response during clinical evaluation.
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Cornetta et al. (1981) studied this question.
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