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A Chronic Impairment of Colour Vision in Users of LSD

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A Chronic Impairment of Colour Vision in Users of LSD


Summary: Forty-six users of the hallucinogen lysergic acid diethylamide were

compared with 31 controlson a testof colour discriminationan average of two

years after their last exposure to the drug. Controls performed better than users,

and LSD users without flashbacks performed better than users with flashbacks.

An analysis of variance between the three groups was significant at P <0.001.

This study suggests that some users of LSD may have a sustained or irreversible

impairment in colour discrimination.

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