Why Cannabis helps for Glaucoma:

Cannabis can treat glaucoma or slow down its progression because it lowers the intraocular pressure (IOP) or the pressure of the fluid inside the eye. 

Some studies show that cannabis can treat glaucoma. The first study published in 1971 titled “Marijuana Smoking and Intraocular Pressure” found a 30% decrease in eye pressure, among a significant number of participants, after smoking marijuana. Since then many studies have been published confirming that cannabinoids may reduce the pressure of the eye.

How Cannabis works for Glaucoma:

The exact mechanism behind how cannabis lowers eye pressure is not properly understood yet and still being researched. However, some studies suggest that tetrahydrocannabinol (THC) dilates the blood vessels in the eyes, causing them to expand, thereby reducing eye pressure.

Accordingly, this helps treat and even prevent the main cause of glaucoma and reduces its progression.

How to use Cannabis for Glaucoma:

Cannabis can be used to treat glaucoma in the following forms:

1- Smoking: this is the quickest way to get the effect of cannabis. It can be rolled into a cigarette or smoked in a water pipe, either as herbal cannabis or hash. When it is inhaled, THC would need between 1 and 10 minutes to reach the brain for someone to feel its effect. 

2- Oral use (per oz.): hash oil can be taken as drops under the tongue, especially for medical purposes, or it can also be swallowed as baked products or herbal tea. For instance, cannabis leaves, hash, and oil can be mixed into brownies, cookies, and other foods.

If a person consumes cannabis, it will take longer for him or her to feel its effects because it needs to go through the digestive system before it gets into the bloodstream. It might take anywhere between 30 minutes to 5 hours for the body to absorb cannabis properly.

Cannabis dose for Glaucoma:

There is no official recommended dose of cannabis for glaucoma as it varies depending on one’s condition, weight, gender, and age. The quality of the plant can play a role as well.

Always consult your doctor before using cannabis to avoid taking the wrong dosing of cannabis.

The dosage of cannabis for glaucoma depends on what methods people choose to use. When cannabis is smoked, the effect of a marijuana cigarette can last between 3-4 hours.

Thus, a person would need to smoke 6-8 cigarettes per day to reduce eye pressure over a period of 24 hours. That is the equivalent of ingesting 18-20 mg of THC.

Doses between 10-20 mg have effectively reduced eye pressure when cannabis is ingested as oil. However, maintaining the proper dose of CBD is important because doses above 40 mg may have the opposite effect and increase intraocular pressure (IOP) in the eye.

Factors affecting Cannabis quality: 

Several factors can impact the plant’s potency and alter its effects on the body. These factors affect the dosage each person can take. They include:

- The type of cannabis plant

- The quality of the plant

- How cannabis was used i.e., whether it was smoked or ingested

- How the plant was processed

Therefore, defining the exact dosage remains challenging. It will be subject to disparity until a specific product is defined, tested properly, and officially approved by the government.

Using Cannabis for Glaucoma: precautions

If you are considering taking CBD for glaucoma, there are some precautions that you should take into consideration:

- Alcohol: cannabis should not be mixed with alcohol since it may cause dizziness, drowsiness, and impaired judgment. Alcohol will increase these effects.

- Medications: cannabis can increase the effects of medications that cause drowsiness such as antihistamines, antidepressants, seizure medicine, and pain relievers among others. 

- Pregnancy or breastfeeding: women should avoid using cannabis during pregnancy or if they are planning on becoming pregnant. Smoking may increase the risk of having a child born with physical and mental defects, and a lower birth weight.

- Driving: cannabis use can cause dizziness, drowsiness, and impaired judgment. Therefore, it’s important to avoid driving so you don’t endanger yourself or harm others.

Using Cannabis for Glaucoma: side effects

Smoking cannabis might have some negative side effects. That is why doctors recommend taking CBD oil rather than smoking cannabis for medical purposes. These harmful effects might include developing:
 
- Respiratory problems: smoking cannabis can irritate the lungs and increase the risk of several conditions like chronic bronchitis and cancer of the respiratory tract.

- Heart disease: smoking cannabis increases the heart rate and might aggravate existing heart conditions.

- Mental health problems: the THC component of cannabis can decrease concentration levels, which can worsen short-term memory. When taken in high doses, it can even cause hallucinations and delusions.

- Addiction: many people who smoke cannabis long term might develop an addiction and depend on it because its THC component makes them feel “high.”