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Reduction of congenital nystagmus in a patient after smoking cannabis.

Abstract

INTRODUCTION
Smoking cannabis has been described to reduce acquired pendular nystagmus in MS, but its effect on congenital nystagmus is not known.
PURPOSE
To report the effect of smoking cannabis in a case of congenital nystagmus.
METHODS
A 19-year-old male with congenital horizontal nystagmus presented to the clinic after smoking 10 mg of cannabis. He claimed that the main reason for smoking cannabis was to improve his vision. At the next clinic appointment, he had not smoked cannabis for 3weeks. Full ophthalmologic examination and eye movement recordings were performed at each visit.
RESULTS
Visual acuity improved by 3 logMar lines in the left eye and by 2 logMar lines in the right eye after smoking cannabis. The nystagmus intensities were reduced by 30% in primary position and 44%, 11%, 10% and 40% at 20-degree eccentricity to the right, left, elevation and depression, respectively, after smoking cannabis.
CONCLUSION
Cannabis may be beneficial in the treatment of congenital idiopathic nystagmus (CIN). Further research to clarify the safety and efficacy of cannabis in patients with CIN, administered for example by capsules or spray, would be important.

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  • Publisher Full Text
  • Authors

    Pradeep A, Thomas S, Roberts EO, Proudlock FA, Gottlob I

    Source

    Strabismus 16:1 pg 29-32

    MeSH

    Adult
    Eye Movements
    Humans
    Male
    Marijuana Smoking
    Nystagmus, Congenital
    Visual Acuity

    Pub Type(s)

    Case Reports
    Journal Article
    Research Support, Non-U.S. Gov't

    Language

    eng

    PubMed ID

    18306120