![]() Anthony Robson, an ophthalmologist at the University College London who was also not involved in the study, noted that the researchers examined the people's marijuana use through urine tests, which are not as accurate as blood tests. In an editorial that was published in the same journal as the study, Lyons and Dr. Indeed, the marijuana users in the study did not experience any actual visual symptoms or changes in the quality of their vision, Lyons told Live Science. Lyons noted that although the electroretinography results suggested a difference between marijuana users and nonusers, the delay didn't seem to translate into actual problems with the users' vision. Lyons, an ophthalmologist at the University of British Columbia, who was not involved in the study. More research is needed to determine whether marijuana use really is linked to changes in the functioning of those cells, said Dr. Vincent Laprévote, a psychiatrist at Pôle Hospitalo-Universitaire de Psychiatrie du Grand Nancy in France.īut some experts argue that the study had significant limitations, and because of this, it's unclear whether or not there is an actual link between marijuana use and these effects. ![]() It's not clear whether this potential effect of marijuana is permanent, or would stop when a person stops using the drug, said study co-author Dr. ![]() 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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