ACCOMMODATION AND VERGENCE Optometry and Vision Science July 1, 1968 Meredith W. Morgan 143 citations Changes of spatial distortion threshold in response to the hallucinogen, psilocybin, were measured. A marked loss of compensation for optically induced distortions at drug peak was found. Compensation returned as the drug course elapsed. DOI: 10.1097/00006324-196807000-00002 (opens in new tab) Psilocybin Accommodation Hallucinogen Compensation psychology +3