Are marijuana's effects on vision good or bad? This may impact the eyesight of people who use marijuana regularly, even if the influence is. Health experts agree that smoking marijuana can damage the lungs. effects of marijuana on vision, we do know that the drug has a few key effects on the eyes. Marijuana has no effect, whatsoever, on glaucoma. Period. If only it were that simple. "Most eye care practitioners understand that marijuana is.
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Outfitted with a machine used for measuring night vision, a 2: Other reports back this evidence up. For example, Jamaican fisherman noticed a significant increase in night vision after ingesting a cannabis tincture. Even more shocking were claims by registered blind journalist Sue Arnold in the Observer. Smoking strong Skunk flower allowed her to see temporarily. Last year, researchers from the University of Waterloo, Ontario, announced that babies exposed to cannabis in the womb have better vision , finding significant improvement in their ability to track moving objects.
However, this controversial study shows that there is, most-likely, a positive connection between visual processing in the brain and cannabis consumption.
In comparison, unborn babies exposed to alcohol demonstrated a negative effect on their vision. Science has proven the association between creativity and cannabis. Sign up for our newsletter. See for yourself what studies suggest. Cannabis lowers the intraocular pressure of people with glaucoma.
In people with elevated intraocular pressure the outflow of fluid from the anterior chamber of the eye becomes restricted, causing pressure to build up like water behind a dam. Increased pressure in the eye contributes to glaucoma by decreasing the flow of nutrients to the optic nerve, scientists suspect. Because elevated intraocular pressure is the only significant risk fac tor for glaucoma that can be controlled, most treatments to date have been designed to reduce it.
Unfortunately, reducing intraocular pressure does not always stop or even slow the progress of glaucoma toward blindness. Drugs can alter intraocular pressure by acting on different circulation routes of the aqueous humor see Table 9. One important outflow route is the trabecular meshwork, a latticework of connective tissue and cells.
The fluid flows through this tissue, into a little canal, and out of the eye, where it joins the blood-stream. Such drugs as epinephrine or dipevefrin work by changing the shape of certain cells, resulting in improved flow through the trabecular meshwork. Pilocarpine, another type of drug, contracts the muscle that controls the shape of the trabecular meshwork making it easier for fluid to pass through, whereas timolol, yet another type of drug, interferes with fluid manufacture by the ciliary epithelium.
Other drugs, such as apraclonidine and brimonidine, also reduce the amount of fluid produced. Finally, an additional type of drug simulates the production of agents that ease the passage of aqueous humor from the eye.
There are also surgical options for controlling elevated intraocular pressure. The trabecular meshwork can be cut with a laser, allowing the fluid to move out of it more easily.
Alternatively, a surgeon can remove a piece of the eye wall and allow fluid to drain out under the conjunctiva. Doctors can also insert tiny drainage tubes, similar to those used for middle-ear problems, inside the eye to allow fluid drainage to the outer layers of the eye. Lastly, laser, heat, or cold can be used to destroy the ciliary epithelium, which secretes the aqueous humor. Several clinical studies have found that cannabinoids or marijuana reduce intraocular pressure IOP as well as do most conventional glaucoma medications.
Smoked or eaten marijuana, THC and synthetic cannabinoids in pill form, and intravenous injections of several natural cannabinoids have all been shown to reduce IOP significantly in both glaucoma patients and healthy adults with normal IOP. In most trials a single dose of marijuana or cannabinoid maintained this effect for three to four hours. Researchers have yet to explain how marijuana and cannabinoids reduce IOP.
But while clearly effective in reducing IOP, marijuana-based treatments for glaucoma have numerous drawbacks. Marijuana reduces blood pressure and produces psychological effects that some people—particularly the elderly—find intolerable. Several patients in these studies also reported that their hearts pounded or raced and that they felt uncomfortably anxious after taking cannabinoids. All of these effects could prove especially problematic for people at risk for cardiovascular disease and stroke; moreover, reduced blood pressure could decrease blood flow to the optic nerve, counteracting the benefits of reducing IOP.
Finally, their short duration of effect means that marijuana-based medicines must be taken up to eight times a day, which most patients are unlikely to do; other medicines reduce IOP equally well and need only be taken once or twice a day.
This is an important difference because patients need to control IOP continuously due to the progressive nature of glaucoma.
It is possible that future research could reveal a therapeutic effect for isolated cannabinoids other than THC or produce synthetic cannabinoid analogs that last longer and have fewer side effects. But the most promising line of research for treating glaucoma lies in the development of therapies that can protect or rescue the optic nerve from damage or that can restore its blood supply. There is some evidence that a synthetic cannabinoidlike compound known as HU has nerve-protecting properties, although it does not reduce IOP.
HU is chemically similar to THC, but it is not found in the marijuana plant and does not bind to the cellular receptor in brain cells that THC activates.
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How Cannabis Affects the Eyes online-casino-player.info #Cannabis #eyes # Glaucoma #vision #blind #diabetes #blindness #eyesight #. The ways in which cannabis affects eyesight needs further investigation. However, this early research offers even more reason to investigate. Research findings from as early as the s show that both marijuana and Increased pressure in the eye contributes to glaucoma by decreasing the flow of IOP significantly in both glaucoma patients and healthy adults with normal IOP.