Does CBD Lower Eye Pressure for Glaucoma?

Intraocular pressure, often called IOP, is the fluid pressure inside your eye. This pressure comes from a clear liquid called aqueous humor that your eye constantly makes and drains. When the balance between production and drainage goes wrong, pressure can build up.

In population studies, eye pressure typically ranges from 10 to 21 millimeters of mercury, but this is a statistical average, not a safe threshold for everyone. Some people develop glaucoma even with pressure in this range, a condition called normal-tension glaucoma, while others tolerate higher pressures without damage. Your eye doctor determines a target pressure based on your individual risk factors and optic nerve health. Elevated pressure can damage the delicate nerve fibers in the back of your eye, leading to permanent vision loss if left untreated.

The optic nerve is like a cable made up of more than a million tiny nerve fibers that carry visual information from your eye to your brain. When eye pressure rises too high, it squeezes and damages these fibers over time. Once nerve fibers die, they cannot grow back.

This damage typically begins in your peripheral vision, so you might not notice it at first. By the time you experience vision changes, significant and permanent nerve damage has usually already occurred.

Open-angle glaucoma, the most common type, usually has no early symptoms. Most people feel fine and do not notice any vision problems until the disease has progressed. This is why regular eye exams are so important for early detection.

• Gradual loss of peripheral (side) vision in both eyes
• Tunnel vision in advanced stages
• Sudden eye pain, headache, nausea, or blurred vision (signs of acute angle-closure glaucoma)
• Seeing halos around lights

Certain factors make you more likely to develop glaucoma. Age is a major risk factor, with people over 60 at higher risk. Family history also matters, as glaucoma often runs in families.

• Being over age 60
• African or Hispanic ancestry (higher risk for open-angle glaucoma) or Asian ancestry (higher risk for angle-closure glaucoma)
• Having a family history of glaucoma
• Higher-than-average eye pressure or thin central cornea
• Diabetes, high blood pressure, heart disease, or obstructive sleep apnea
• Severe nearsightedness or farsightedness
• Past eye injury, certain eye surgeries, or long-term corticosteroid use in any form

We measure your eye pressure using a test called tonometry. A gentle puff of air is often used for screening and provides a useful estimate of your pressure. For more precise measurement, we may use a small probe that briefly touches your eye after we apply numbing drops, which can cause mild pressure sensation. Factors like corneal thickness and biomechanics influence the readings, so we interpret your pressure in context.

However, measuring pressure alone is not enough to diagnose glaucoma. A comprehensive glaucoma evaluation typically includes several tests to get a complete picture of your eye health:

• Optic nerve examination and often OCT imaging to assess nerve fiber thickness
• Visual field testing to check for peripheral vision loss
• Gonioscopy to evaluate the drainage angle inside your eye
• Pachymetry to measure corneal thickness
• Sometimes repeat or diurnal IOP checks at different times of day

Prescription eye drops are the most common first treatment for glaucoma. We have several classes of drops that work in different ways to either decrease fluid production or increase drainage. These medications are backed by decades of research showing they reduce the risk of glaucoma progression and vision loss when used consistently and correctly.

Proper technique and adherence are critical for eye drops to work effectively. Side effects vary by medication class, so we will discuss what to expect and monitor for with your specific prescription.

• Prostaglandin analogs that increase fluid outflow (usually used once daily)
• Beta-blockers that reduce fluid production
• Alpha agonists that both decrease production and improve drainage
• Carbonic anhydrase inhibitors that slow fluid production

Selective laser trabeculoplasty, or SLT, uses targeted laser energy to improve drainage through the eye's natural drainage channels. We may recommend SLT as a first-line treatment option for some patients with open-angle glaucoma or ocular hypertension, or as an addition to eye drops if pressure is not adequately controlled. The procedure is done in our office and takes only a few minutes.

Laser treatment is usually well tolerated, though you may feel mild discomfort or pressure during the procedure. The effect varies from person to person. Many patients see meaningful pressure reduction that may last months to years, while some need repeat SLT or additional therapy. SLT carries low risk and can often be repeated if needed.

For glaucoma that does not respond well to drops or laser treatment, surgery may be necessary. Traditional surgery creates a new drainage pathway for fluid to leave the eye. Newer minimally invasive glaucoma surgeries, or MIGS, offer less invasive options with faster recovery for some patients.

Surgery carries more risk than drops or laser, but it can provide better long-term pressure control for people with advanced disease. We carefully discuss the risks and benefits of each surgical option based on your specific situation.

Once we start treatment, we will schedule regular follow-up appointments to measure your eye pressure and check for any changes in your optic nerve or vision. Most patients need to be seen every three to six months, though some require more frequent monitoring.

We set an individualized target eye pressure for you based on the severity of your glaucoma, your baseline pressure, and your rate of progression. We adjust your treatment if pressure remains above target or if we see continued nerve damage despite treatment. Glaucoma management is a long-term partnership between you and our eye doctor, with the goal of preserving your remaining vision for life.