To study how well the participants' retinal ganglion cells worked, the researchers used a method called pattern electroretinography, which provides information about how well those cells function, as well as how fast they transmit visual information from the retina to the brain.

The test revealed that, compared to the people who didn't use marijuana, those who did use the drug had a slight delay in how long it took for information to be transmitted from the retina to the brain, according to the study.

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