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Chemical in Marijuana Raises IOP

■ A study from researchers at Indiana University has found that a major chemical component in marijuana called cannabidiol (CBD) appears to increase the pressure inside the eye. The results were reported in the journal Investigative Ophthalmology & Visual Science.

The study, which was conducted in mice, specifically found that CBD caused an increase in pressure inside the eye of 18% for at least 4 hours after use. Tetrahydrocannabinol, or THC, the primary psychoactive ingredient of marijuana, was found to effectively lower pressure in the eye, as has been previously reported. The Indiana University study found that the use of CBD in combination with THC blocked the effect of THC.