A new study published in JAMA Opthamol found that regular cannabis use can delay how visual information is processed in the eye’s retina.
Researchers found that regular pot users experience a slight delay in the functioning of their retinal ganglion cells (RGCs). These cells work to process incoming visual information and are responsible for connecting the retina to the brain, according to an article in Medical XPress. However, researchers cautioned that the study was small, and they're still not sure if the delay is permanent or may recede over time when the user stops smoking pot.
These retinal cells are also partially responsible for transforming light into a series of electrical pulses, called action potentials, in the brain, CNN reported.
Researchers examined 52 participants, 28 of whom were regular marijuana users — meaning they used cannabis at least seven times a week. They found that cannabis smokers experienced a delayed response time in processing visual information when compared to the control group. The pot users "experienced a 10-millisecond delay in the speed with which their RGCs sent key signals to the brain via the optic nerve," Medical Xpress reported.
Following the study, the research team suggested that smokers might be experiencing vision trouble without being consciously aware of it.
"Such an anomaly could be imperceptible for cannabis users," Dr. Vincent Laprevote — lead author of the study and a physician at Pole Hospitalo-Universitaire de Psychiatrie du Grand Nancy in Laxou, France — told CNN. "However, it is important, since it could reflect the changes in the communication between neural cells implied by regular cannabis use."
Many proponents of marijuana claim that it has no lasting effects on the body. Science has proven that this is not true. Marijuana can impact many systems in the body, including the eyes. In fact, marijuana is often touted as a treatment for patients with glaucoma.
How does marijuana impact vision?
Marijuana’s Impact on the Body
There are many known effects on the body when using marijuana. Some of these relate to the eyes while others impact other areas of the body. Studies have found that attention, memory and learning are all impaired by heavy marijuana use, even after stopping the drug for more than 24 hours. Marijuana users also exhibit impaired driving abilities, slower reaction times and difficulty concentrating. Marijuana can also impact perception, making colors appear brighter, etc. When it comes to eyesight marijuana commonly alters peripheral vision.
Marijuana has long been known to have an impact on nervous system communications, according to Medical XPress.
Source: Schwitzer T, Schwan R, Albuisson E. Association Between Regular Cannabis Use and Ganglion Cell Dysfunction. JAMA Ophthalmol. 2016.
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