Glaucoma
Understanding What Glaucoma Is and Why It Matters
Your eye constantly makes a clear fluid called aqueous humor that flows through the front of your eye and drains out through tiny channels. When glaucoma develops, these drainage channels become blocked or do not work properly, causing fluid to build up. The increased pressure can press on and damage the optic nerve, which is made up of more than a million tiny nerve fibers.
Once these nerve fibers are damaged, they cannot grow back or heal. The damage typically starts with fibers that carry information about your peripheral vision, so you lose side vision first while central vision remains clear for a long time.
Most forms of glaucoma develop slowly over many years without causing pain or obvious vision changes at first. Your brain is very good at filling in missing spots in your vision, so you may not realize anything is wrong until significant damage has occurred. By the time you notice vision loss, you may have already lost a substantial amount of peripheral vision that cannot be restored.
This is why we emphasize regular comprehensive eye exams, especially as you get older or if you have risk factors. Our eye doctor can detect early signs of glaucoma long before you notice any symptoms, giving us the best chance to preserve your sight.
Glaucoma cannot be cured, and vision loss from glaucoma is permanent. However, when we catch it early and treat it properly, most people keep useful vision throughout their lives and do not go completely blind. Treatment focuses on lowering eye pressure to slow or stop further damage to the optic nerve.
The key is starting treatment as soon as possible after diagnosis and staying consistent with your care plan. With today's treatment options, including eye drops, laser procedures, and surgery, we can often control eye pressure well enough to prevent severe vision loss.
Glaucoma affects millions of people and is one of the leading causes of blindness worldwide. It can develop at any age, but it becomes much more common after age 60. Certain groups face higher risk, and the condition often runs in families.
- People over age 60 have a significantly increased risk
- Family history of glaucoma raises your chances considerably
- The condition affects people of all backgrounds but risk varies by ancestry
- People of African and Afro-Caribbean descent have higher open-angle glaucoma risk, as do Hispanic and Latino populations with age
- East Asian and Inuit populations have higher angle-closure glaucoma risk
- Many people have glaucoma without knowing it because they have never had a comprehensive eye exam
Recognizing Glaucoma Symptoms and Warning Signs
The most common type of glaucoma, called open-angle glaucoma, develops very gradually. You have two eyes that work together, and the good areas of vision in one eye compensate for the damaged areas in the other eye. Your brain seamlessly combines the images from both eyes, masking the vision loss.
Additionally, the damage usually begins in the far outer edges of your peripheral vision, areas you do not actively use for tasks like reading or recognizing faces. You might have glaucoma for years and pass a driver's license vision test while significant damage is quietly progressing. Some patients, especially with normal-tension glaucoma, can develop paracentral blind spots that affect reading earlier.
When glaucoma has progressed enough for you to notice symptoms, you might experience certain vision changes. These symptoms mean damage has already occurred, so do not wait for symptoms to develop before getting examined. These symptoms are nonspecific and some, like needing more light, can be caused by other eye conditions such as cataract.
- Blank spots or patches in your side vision that you notice when you pay attention
- Difficulty seeing things to the side while looking straight ahead
- Trouble with glare or adjusting to dark rooms
- Needing more light to read or do close work
- Bumping into objects on your sides because you do not see them
A less common but very serious type called acute angle-closure glaucoma happens suddenly when the drainage angle closes completely. This is a medical emergency that can cause permanent vision loss within hours if not treated immediately. Seek emergency care right away if you experience these symptoms.
- Severe eye pain that comes on suddenly
- Intense headache, often with nausea and vomiting
- Blurred vision or sudden vision decrease
- Seeing rainbow-colored halos around lights
- Red eye with a cloudy or hazy-looking cornea
As glaucoma progresses without treatment, the loss of peripheral vision becomes more noticeable. You might feel like you are looking through a tunnel, with clear vision only in the center and darkness or blurriness all around the edges. Some people describe it as looking through a paper towel tube.
If glaucoma damage continues, the tunnel gets narrower and narrower, eventually affecting central vision too. This advanced stage makes daily activities like walking, driving, and recognizing people very difficult. This is why we work hard to prevent progression before you reach this point.
Glaucoma is rare in infants and children but can occur. Urgent signs include excessive tearing, extreme sensitivity to light, and enlarged cloudy corneas. These symptoms require prompt evaluation by an eye care specialist.
Risk Factors and What Puts You at Higher Risk
Your risk of developing glaucoma increases significantly with each decade after age 40, and it rises sharply after age 60. Getting older is the single biggest risk factor that applies to everyone. If you have a parent, sibling, or child with glaucoma, your risk is much higher than someone without family history.
When glaucoma runs in families, it often develops earlier and may be more aggressive. We recommend that anyone with a close relative who has glaucoma start getting comprehensive eye exams at a younger age and more frequently than people without family history.
High pressure inside the eye is a major risk factor for glaucoma, although some people develop it even with normal pressure. People who are very nearsighted have a higher risk, as do those with thinner corneas. The anatomy of your eye, including the size and structure of the drainage angle, also plays an important role.
- Elevated eye pressure over time can damage the optic nerve
- Thin corneas both increase risk and can cause underestimation of true pressure on some tonometry methods
- A narrow drainage angle increases the risk of angle-closure glaucoma
- Very high nearsightedness changes the structure of the optic nerve area
- High hyperopia is a risk for narrow angles and angle-closure glaucoma
Several health conditions affect your glaucoma risk. Diabetes can increase your chances of developing glaucoma, and high blood pressure that is not well controlled may also play a role. Past eye injuries, even ones that happened years ago, can lead to glaucoma later on.
Other conditions that raise risk include previous eye surgery, inflammatory eye diseases, and certain blood flow problems that affect the optic nerve. We will ask about your complete medical history to assess your individual risk level and determine how closely we need to monitor you.
Long-term use of steroid medications can raise eye pressure and increase glaucoma risk. This applies to steroid eye drops, pills, inhalers, nasal sprays, and creams, especially when used for months or years. If you need steroids for another health condition, we may recommend more frequent eye pressure checks. Do not start or stop steroid eye drops without guidance from your prescriber.
Always tell us about every medication you take, including prescriptions, over-the-counter drugs, and supplements. We need to know if you are starting steroids so we can monitor your eyes appropriately and catch any pressure increases early.
- Topiramate can cause angle closure in susceptible eyes
- Anticholinergics found in some bladder medications and cold remedies can trigger angle closure
- Adrenergic decongestants may precipitate angle closure
- Certain antidepressants and some antihistamines carry risk for angle closure
- Seek urgent care for sudden eye pain, halos, or decreased vision after starting any new medication
Glaucoma Testing and Diagnosis
A complete glaucoma evaluation involves several painless tests that together give us a detailed picture of your eye health. The entire exam typically takes 30 to 60 minutes, depending on what tests our eye doctor needs. We will dilate your pupils with drops so we can examine the optic nerve thoroughly, which makes your vision blurry for a few hours afterward. If the angle is very narrow, dilation may be deferred or done with precautions or after a laser iridotomy.
During the exam, we measure eye pressure using Goldmann applanation tonometry as the standard pressure test, examine the drainage angle with a technique called gonioscopy, look closely at your optic nerve, test your peripheral vision, and measure corneal thickness. Corneal thickness affects pressure readings and interpretation. We may also take photographs or scans of your optic nerve to create a baseline for comparison at future visits.
We measure eye pressure using a test called tonometry. Eye pressure naturally varies throughout the day, and a single normal reading does not rule out glaucoma. Some people have higher pressure in the morning, while others peak in the evening. Some patients may need a diurnal pressure profile or additional checks at different times of day.
If your pressure is elevated or you have other risk factors, we may ask you to come back at different times of day for additional measurements. We also check pressure at every follow-up visit because keeping it controlled over time is the main goal of glaucoma treatment.
Our eye doctor examines your optic nerve through a dilated pupil using special magnifying lenses. We look for signs of damage such as increased cupping, which means the nerve has a larger hollow area in the center than it should. We also check for thinning of the nerve tissue and small hemorrhages around the nerve.
- Optical coherence tomography creates detailed cross-sectional images of the optic nerve and surrounding tissue and also measures retinal nerve fiber layer and ganglion cell complex thickness
- Optic nerve photographs document the appearance for future comparison
- These imaging tests can detect very early changes before vision loss occurs
- Serial images over time help us see if damage is progressing despite treatment and detect progression
Visual field testing maps your peripheral vision by having you look straight ahead at a central target while responding to small flashing lights in your side vision. The test takes about 10 to 15 minutes per eye and requires concentration, but it is not painful or uncomfortable.
The results show us exactly where you can and cannot see, revealing patterns of vision loss typical of glaucoma. We repeat this test regularly to monitor whether your vision is staying stable with treatment or if we need to adjust your care plan to better control progression.
Screening recommendations depend on your age and risk factors. If you have no risk factors, we generally recommend comprehensive eye exams every 5 to 10 years before age 40, every 2 to 4 years between ages 40 and 54, every 1 to 3 years between ages 55 and 64, and every 1 to 2 years after age 65.
We recommend more frequent exams if you have risk factors such as family history, elevated eye pressure, or suspicious optic nerve appearance. Once you are diagnosed with glaucoma, you will need exams every three to six months or even more often depending on how well controlled your condition is.
Treatment Options for Managing Glaucoma
We usually start glaucoma treatment with prescription eye drops that lower eye pressure. Several different types of drops work in different ways, either by decreasing fluid production in the eye or by improving drainage. Most people need to use their drops every day for the rest of their lives to keep pressure controlled.
- Prostaglandin analogs are used once nightly and may cause redness, lash growth, or darkening of iris and skin
- Beta-blockers may worsen asthma or COPD and can slow heart rate, so tell us about heart or lung disease
- Alpha-agonists can cause fatigue and dry mouth and should be avoided in very young children
- Carbonic anhydrase inhibitors may have a bitter taste, so discuss sulfonamide allergy history with us
- Rho-kinase inhibitors commonly cause redness
- Preservative-free options can help if you have irritation or ocular surface disease
To use drops safely, remove soft contact lenses if drops contain preservatives and wait 15 minutes before reinsertion. Use punctal occlusion for 1 to 2 minutes after instilling drops to reduce systemic absorption. If using multiple drops, separate them by at least 5 minutes.
The drops only work if you use them consistently as prescribed. We will teach you the proper technique for putting in drops and discuss strategies for remembering to use them. Some people need more than one type of drop, and combination drops that include two medications in one bottle are available to simplify your routine.
We may recommend laser treatment if drops are not lowering your pressure enough, if you have trouble using drops regularly, or as an initial treatment in certain situations. Selective laser trabeculoplasty can be used as initial treatment for open-angle glaucoma or ocular hypertension and is a common procedure that improves drainage by treating the trabecular meshwork, the eye's natural drainage system. The treatment takes only a few minutes in our office and is generally well tolerated.
- Laser treatment can lower pressure by about 20 to 30 percent
- The effects may last several years but can wear off over time
- The procedure can be repeated if needed
- You may still need drops even after laser treatment
- Possible short-term side effects include temporary eye irritation and a pressure spike that needs a check soon after the laser
Laser peripheral iridotomy is used for narrow or occludable angles and for angle-closure glaucoma suspects. This procedure creates a small opening in the iris to allow fluid to flow more easily and equalize pressure between the front and back of the eye. It can be prophylactic in the fellow eye after an acute angle-closure attack to prevent the same emergency from occurring in that eye.
- The procedure takes just a few minutes and is done in the office
- Temporary side effects may include light sensitivity and a transient pressure rise
- Follow-up pressure checks are needed after the procedure
- Most patients experience significant protection against angle-closure episodes
If medications and laser treatment do not control your eye pressure adequately, we may recommend surgery. Traditional surgery like trabeculectomy creates a new drainage channel for fluid to leave the eye. Newer minimally invasive glaucoma surgeries are also available and may be appropriate depending on your specific situation.
Lens extraction, also called cataract surgery, can deepen the angle and is often first-line for primary angle-closure disease. It is also used to help control pressure in open-angle disease in selected patients, particularly when cataract is present.
- Trabeculectomy creates a new drainage pathway but carries risks including infection, hypotony, and bleb leak
- Tube shunts are long-term implants that may cause potential double vision
- Minimally invasive glaucoma surgeries are often combined with cataract surgery
- Cyclophotocoagulation options such as micropulse transscleral or endoscopic techniques are available for refractory glaucoma
Surgery carries risks like any operation, but it may be necessary to preserve your remaining vision when other treatments are not working well enough. We will discuss the benefits and risks of different surgical approaches if you need this level of treatment. After surgery, typical post-operative monitoring includes frequent pressure checks and examinations. Call us urgently if you experience increasing pain, sudden vision drop, pus, or a bleb leak.
The goal of all glaucoma treatment is to lower eye pressure enough to slow or stop further damage to your optic nerve. Treatment cannot restore vision you have already lost, but it can help you keep the vision you still have. Most people respond well to treatment and maintain useful vision throughout their lives.
We establish an individualized target pressure for each patient based on the severity of glaucoma, rate of progression, and other factors. This target pressure is the level we aim to reach and maintain with treatment. The target may be adjusted over time based on optic nerve and visual field changes, and achieving the target helps preserve your remaining vision.
Success depends on finding the right treatment for your individual situation and following your care plan consistently. We will monitor your pressure, optic nerve, and visual field regularly to make sure your treatment is working. If we see signs of progression, we will adjust your treatment to better protect your vision.
Using eye drops every single day for years can be challenging, but it becomes routine for most people over time. Setting up reminders on your phone, keeping drops in the same spot, or linking drop use to another daily habit like brushing your teeth can help you stay consistent.
- Let us know if you experience side effects from your drops so we can try different medications
- Bring your drops to every appointment so we can review your technique
- Tell us if cost is a barrier because alternatives or assistance programs may be available
- Never stop using your drops without talking to us first, even if you feel fine
- Refill prescriptions before you run out so you never miss doses
Some glaucoma drops require caution or avoidance during pregnancy and breastfeeding. Your treatment plan may need to change if you are pregnant, planning pregnancy, or breastfeeding. Using punctal occlusion after instilling drops reduces systemic exposure to the medication. Always tell our eye doctor if you are pregnant, planning pregnancy, or breastfeeding so we can choose the safest options for you and your baby.
Daily Life with Glaucoma
Many people with glaucoma continue driving safely for years or even permanently, especially when we catch and treat the condition early. Your ability to drive depends on how much vision you have, particularly your peripheral vision and how well you see in both eyes together. Each state has different vision requirements for a driver's license.
We will be honest with you about whether your vision is safe for driving. If you have significant peripheral vision loss, driving may become dangerous because you cannot see cars, pedestrians, or obstacles to the side. Your safety and the safety of others on the road is most important, and we can help you explore transportation alternatives if driving is no longer safe.
You can continue most normal activities and exercises with glaucoma. Regular physical activity is actually good for your overall health and may help with eye pressure control. Walking, swimming, biking, and moderate aerobic exercise are generally safe and beneficial.
We may recommend avoiding certain activities depending on your specific situation. Exercises that involve being upside down, like headstands or inversion yoga poses, can temporarily raise eye pressure. Contact sports that carry a high risk of eye injury need extra caution or protective eyewear. Discuss your exercise routine with our eye doctor to get personalized advice.
- Avoid heavy straining or breath-holding during lifting as it can raise eye pressure
- Limit prolonged head-down positions that may increase pressure
- Consider protective eyewear for contact sports to prevent eye injury
- If you have advanced disease, discuss high-resistance wind instrument playing with us
The most important thing you can do to protect your vision is use your prescribed medications exactly as directed and keep all follow-up appointments. Beyond medication compliance, other healthy habits support your eye health and overall well-being.
- Wear sunglasses outdoors to protect your eyes from UV damage
- Maintain a healthy diet rich in leafy greens and omega-3 fatty acids
- Control other health conditions like diabetes and high blood pressure
- Avoid smoking, which can worsen eye health
- Protect your eyes from injury by wearing safety glasses during risky activities
- Get evaluated for sleep apnea if you have snoring or daytime sleepiness
- If you have normal-tension glaucoma, discuss blood pressure medication timing with your primary care clinician to avoid excessive nocturnal blood pressure dips
Regular monitoring is essential because glaucoma can worsen even when you are using treatment. At follow-up visits, we check your eye pressure, examine your optic nerve for any changes, and periodically repeat visual field tests to make sure damage is not progressing. How often you need appointments depends on how advanced your glaucoma is and how well controlled your pressure is. Red-flag symptoms after any procedure that warrant urgent contact include severe pain, sudden drop in vision, halos with redness, discharge, or a leaking bleb.
Never skip appointments even if you feel fine and your vision seems stable. Changes can happen without symptoms, and catching progression early gives us the opportunity to adjust treatment before you lose more vision. Let us know right away if you notice any vision changes between scheduled visits.
For patients with advanced vision loss from glaucoma, we recommend referral to low-vision rehabilitation services. These specialists can provide training in adaptive strategies and recommend assistive devices such as magnifiers, specialized lighting, and other tools that help you maintain independence and quality of life despite vision loss.
Frequently Asked Questions
Glaucoma does have a genetic component and runs in families, though having a relative with glaucoma does not mean you or your children will definitely develop it. We do recommend that your children and siblings get comprehensive eye exams regularly, starting at an earlier age than people without family history. Early detection in family members gives us the best chance to preserve their vision with treatment.
While a healthy diet supports overall eye health, no specific foods or supplements have been proven to prevent glaucoma or substitute for medical treatment. Some nutrients like antioxidants may support optic nerve health, but they cannot replace prescription medications or procedures. Focus on a balanced diet, regular exercise, and controlling conditions like diabetes and high blood pressure, and always follow your prescribed treatment plan.
Glaucoma usually affects both eyes, but it often progresses at different rates in each eye. One eye typically develops the condition first or has more advanced damage than the other. This is why we examine and treat each eye individually, and you may need different treatments or different strengths of medication in each eye.
Missing occasional doses is not ideal but usually will not cause immediate harm. However, regularly skipping doses allows your eye pressure to rise, which can lead to continued optic nerve damage. If you forget a dose, put in the drop as soon as you remember unless it is almost time for the next dose. Do not double up to make up for missed doses. If you are frequently forgetting, talk to us about strategies or alternative treatments that might be easier to stick with.
While marijuana can temporarily lower eye pressure for a few hours, it is not recommended for glaucoma treatment in 2025. The pressure-lowering effect is brief, lasting only three to four hours, which would require using it many times throughout the day and night. Current evidence-based medications are more effective, longer-lasting, and have fewer side effects. We rely on treatments proven to protect vision over the long term. Some CBD products may raise eye pressure and are not recommended as glaucoma treatment.
Getting Help for Glaucoma Questions, Concerns, and Answers
If you have been diagnosed with glaucoma or have concerns about your risk, we are here to help you understand your condition and create a personalized care plan. Bring your questions to your appointments, and contact our office between visits if you notice vision changes, have trouble with your medications, or need support managing your condition.