With the effect of cannabis on some of the parameters being studied for the first time in this study, the researchers discovered that cannabis had a detrimental effect on all of the visual parameters they assessed.
Another study that investigated the effects of smoking cannabis on vision and driving performance also found that the visual effects of cannabis could impact driving performance, jeopardizing driving safety. Overall, it appears that information and awareness initiatives are critical for reducing the prevalence of cannabis-impaired driving.
Source: It's official. Smoking cannabis substantially alters the way you see (interestingengineering.com)