Objective Testing of Marijuana-Induced Vision Changes
Final rept. 1 May 72-30 Apr 73
OPTICAL SCIENCES GROUP INC PETALUMA CAVISUAL SCIENCES DIV
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Nine vision functions were measured by objective methods in a study sample of 19 experienced, male, marijuana users who smoked a 0.8 gram natural marijuana cigarette containing 1.5 percent 12 milligrams of delta-9- tetrahydrocannabinol. Placebo cigarettes were smoked as a control. The experiments were carried out double-blind with a cross-over design. Six related functions were also measured. Some of the subjects were also given 22 mg THC, alcohol, or Librium in separate experiments. The chief results are a a reduction in glare recovery time with marijuana, b a decrease in intraocular pressure with marijuana, alcohol or Librium, c a deterioration of tracking eye movements with alcohol, d a rapid rise in pulse rate at the start of smoking marijuana followed by a rapid fall within minutes after smoking.