Types of Glaucoma: What Patients Need to Know
Primary Open-Angle Glaucoma
Primary open-angle glaucoma is the most common form of the disease, and it is often called the silent thief of sight because it develops slowly without obvious warning signs. Regular comprehensive eye exams are the most reliable way to catch it early, before meaningful vision is lost.
This type occurs when the eye's drainage system becomes partially blocked at a microscopic level, causing fluid to build up gradually and raise pressure inside the eye. The drainage angle, the area where fluid exits the eye, appears open and normal when examined, which is how this type gets its name. Over time, the increased pressure damages the optic nerve, causing vision to deteriorate slowly and silently.
Anyone can develop this condition, but certain factors raise the risk considerably.
- Adults over 40, with risk increasing each decade
- A parent or sibling with glaucoma
- African American, Hispanic, or Asian ancestry
- High eye pressure, also called ocular hypertension
- Thin corneas or a large cup-to-disc ratio in the optic nerve
- Diabetes, high blood pressure, or severe nearsightedness
If you have one or more of these risk factors, talk with your eye doctor about how often you should be screened.
The early stages of primary open-angle glaucoma produce no pain and no noticeable change in vision. As the disease progresses, side vision begins to fade, and patients may notice difficulty in dim light or with depth perception. By the time these changes are felt, significant nerve damage has often already occurred, which is why waiting for symptoms is never a safe approach.
A comprehensive glaucoma evaluation involves several tests performed together to build a complete picture of your eye health.
- Tonometry to measure pressure inside the eye
- Dilated optic nerve exam to look for signs of damage
- Visual field testing to map peripheral vision
- Optical coherence tomography (OCT) to measure the thickness of nerve fibers
- Gonioscopy to examine the drainage angle
- Pachymetry to measure corneal thickness
The central goal of treatment is to lower eye pressure and prevent further optic nerve damage. Your doctor will recommend a plan based on how advanced the condition is and how your eyes respond over time.
- Prescription eye drops such as prostaglandin analogs, beta-blockers, or alpha agonists
- Selective laser trabeculoplasty (SLT), a laser procedure that improves the eye's natural drainage
- Minimally invasive glaucoma surgery (MIGS) for mild to moderate cases
- Traditional surgery such as trabeculectomy for more advanced disease
- Glaucoma drainage implants when other options are not suitable
Most people with well-controlled primary open-angle glaucoma continue their normal routines and maintain good functional vision. Consistency with treatment, attending follow-up appointments, and communicating any vision changes to your doctor are the keys to long-term success. Many patients live full, active lives with proper ongoing care.
Angle-Closure Glaucoma
Angle-closure glaucoma occurs when the drainage angle inside the eye becomes physically blocked, preventing fluid from leaving and causing eye pressure to spike rapidly. Acute attacks are medical emergencies, and anyone experiencing sudden eye pain with vision changes should seek care immediately without delay.
In angle-closure glaucoma, the iris, the colored part of the eye, moves forward and physically closes off the drainage angle. This blockage prevents fluid from circulating out of the eye, causing pressure to rise sharply. The condition can develop suddenly as an acute attack or gradually over time as the chronic form.
This type is more common in certain groups and tends to be linked to the physical shape of the eye rather than lifestyle alone.
- People of Asian, Inuit, or Hispanic descent
- Women, who are affected more often than men
- Adults over 55
- Farsighted individuals with smaller, more crowded eyes
- People with cataracts that have caused lens swelling
- Those taking medications that dilate the pupil, including some antidepressants and decongestants
An acute angle-closure attack causes severe symptoms that require emergency care right away. Do not wait to see if these feelings resolve on their own.
- Sudden, intense eye pain and headache
- Rapid blurring or loss of vision
- Seeing halos or rainbow-colored rings around lights
- Eye redness and excessive tearing
- Nausea and vomiting
- An eye that feels firm or hard to the touch
Not all angle-closure glaucoma announces itself with a dramatic attack. The chronic form develops slowly, sometimes causing only occasional mild eye discomfort, brief halos around lights, or episodes of slightly blurred vision, particularly when the pupil is dilated in dim lighting. Because these symptoms are easy to dismiss, routine eye exams are critical for catching this form before significant damage occurs.
An acute attack requires immediate intervention to lower pressure and protect the optic nerve. Longer-term treatment focuses on preventing future episodes and protecting the other eye.
- Medications to rapidly reduce eye pressure during an acute attack
- Laser iridotomy, a procedure that creates a small opening in the iris to restore fluid flow
- Preventive treatment of the unaffected eye, since both eyes are often at risk
- Surgery such as trabeculectomy or lens extraction if laser treatment does not provide sufficient control
Normal-Tension Glaucoma
Normal-tension glaucoma challenges a common assumption about the disease because it causes optic nerve damage even when eye pressure readings fall within the normal range. This form is often missed if clinicians focus only on pressure measurement rather than evaluating the optic nerve directly.
In normal-tension glaucoma, eye pressure stays below the threshold traditionally considered elevated (below 21 millimeters of mercury), yet the optic nerve still deteriorates. Researchers believe that reduced blood flow to the optic nerve and increased nerve sensitivity may play important roles, though the exact mechanisms are still being studied.
Certain characteristics appear to raise the risk of this specific form of glaucoma.
- People of Japanese ancestry, where this type is more prevalent
- Women, particularly after menopause
- Those with a family history of normal-tension or low-pressure glaucoma
- People with low blood pressure (hypotension), especially overnight
- Those with vasospastic conditions such as migraines or Raynaud's phenomenon
- Individuals with sleep apnea or conditions that reduce blood oxygen levels
Because eye pressure appears normal, this type can be overlooked if only pressure is measured. The diagnosis requires careful evaluation of the optic nerve's appearance, nerve fiber layer thickness using OCT imaging, and visual field testing to detect peripheral vision loss. A thorough exam is the only reliable way to identify this condition.
Even though pressure is already within normal limits, treatment focuses on lowering it further to reduce stress on the vulnerable optic nerve while also supporting healthy circulation.
- Eye drops to reduce eye pressure below its current baseline
- Lifestyle strategies to support healthy blood flow, including moderate regular exercise
- Management of related conditions such as low blood pressure and sleep apnea
- Monitoring and treating any underlying vascular or systemic health factors
Secondary Glaucoma
Secondary glaucoma develops as a result of another identifiable condition, injury, or medication rather than occurring on its own. Because there is an underlying cause, treatment must address both the root problem and the elevated eye pressure it creates.
Unlike primary forms where no external cause can be identified, secondary glaucoma always has a traceable origin. The drainage system is disrupted by something specific, whether that is inflammation, trauma, medication use, or another eye disease. Identifying and addressing that underlying cause is a critical part of managing this type effectively.
Several different conditions can trigger secondary glaucoma, each affecting the eye's drainage in its own way.
- Inflammatory glaucoma caused by uveitis or other eye infections
- Steroid-induced glaucoma from prolonged use of corticosteroid medications
- Pigmentary glaucoma, where pigment granules from the iris clog drainage channels
- Pseudoexfoliation glaucoma caused by protein deposits that accumulate in drainage structures
- Neovascular glaucoma from abnormal blood vessel growth, often linked to diabetes
- Traumatic glaucoma following a direct eye injury
- Lens-induced glaucoma from cataract complications or a displaced lens
Symptoms of secondary glaucoma vary depending on the underlying cause. Some patients experience eye pain, redness, light sensitivity, or halos around lights, while others notice a gradual change in vision similar to primary glaucoma. Because the presentation is so variable, any new or worsening eye symptoms should be evaluated promptly by an eye doctor.
Treatment combines managing the underlying cause with measures to control eye pressure and limit optic nerve damage.
- Anti-inflammatory medications to treat uveitis-related glaucoma
- Adjusting or discontinuing steroid medications when clinically appropriate
- Managing systemic conditions such as diabetes that contribute to the problem
- Glaucoma medications, laser procedures, or surgery to lower eye pressure directly
Congenital Glaucoma
Congenital glaucoma is a rare condition present from birth in which the eye's drainage system fails to develop properly, causing pressure to build and threatening the developing optic nerve. Early recognition and prompt treatment are essential to give children the best chance at healthy, functional vision.
In congenital glaucoma, the structures responsible for draining fluid from the eye do not form correctly before birth. Fluid accumulates, pressure rises, and the eye may enlarge abnormally in response. The developing optic nerve is particularly vulnerable to this elevated pressure during infancy and early childhood.
Because young children cannot describe their symptoms, parents and caregivers play a critical role in early detection. Contact an eye doctor promptly if you notice any of the following in your child.
- Eyes that appear unusually large or are noticeably different in size
- Cloudy or hazy appearance to the cornea (the clear front of the eye)
- Excessive tearing when the child is not crying
- Significant sensitivity to light, causing squinting or covering of the eyes
- Frequent eye rubbing or keeping the eyes tightly shut
Surgery is typically the first and most effective treatment for congenital glaucoma, as eye drops alone are rarely sufficient in very young patients. Common procedures include goniotomy, which opens blocked drainage channels, and trabeculotomy, which creates new pathways for fluid to exit the eye. These surgeries aim to normalize pressure before permanent optic nerve damage occurs.
With early surgical treatment, many children develop useful vision and lead normal, active lives. However, ongoing monitoring by an eye care team is essential throughout childhood and into adulthood, as additional treatments may be needed as the child grows. Close follow-up is a lifelong commitment for families managing this condition.
Frequently Asked Questions
Below are answers to questions patients often bring to their appointments about glaucoma care, decision-making, and daily life with the condition.
There is currently no cure for glaucoma, meaning that any vision already lost cannot be restored. However, with early detection and consistent treatment, most patients are able to keep their remaining vision stable for decades. The goal of all current therapies is preservation, not recovery, which is why starting treatment early matters so much.
Lifestyle changes alone cannot treat glaucoma, but healthy habits can support the overall goal of protecting the optic nerve. Regular moderate exercise has been shown to help lower eye pressure modestly and improve circulation to the optic nerve. A balanced diet rich in leafy greens, avoiding smoking, and managing overall cardiovascular health are all reasonable steps to take alongside your prescribed treatment plan. Always discuss changes with your doctor before stopping or adjusting any medication.
Most people with controlled glaucoma can continue their regular daily activities without restriction. Activities that may briefly raise eye pressure, such as prolonged inverted positions during certain yoga poses or very heavy weightlifting, are worth discussing with your doctor if they are part of your routine. Your doctor can help you determine whether any specific activity warrants modification based on your current disease stage and pressure control.
Sudden severe eye pain, rapidly blurring vision, or seeing halos around lights are potential signs of an acute angle-closure attack, which is a medical emergency. Do not wait for a scheduled appointment. Go to an emergency eye care provider or emergency room immediately, as irreversible damage can occur within hours if pressure is not reduced quickly. If you are unsure whether your symptoms are urgent, it is always safer to be evaluated right away.
Your eye doctor monitors treatment success through a combination of repeat eye pressure measurements, optic nerve examinations, and visual field tests performed at regular intervals. Stable results across these tests over time indicate that the current treatment plan is effectively controlling the disease. It is important to attend all scheduled follow-up visits even when you feel completely normal, because glaucoma can progress silently even when no symptoms are present.
Yes, glaucoma is not exclusively a condition of infants or older adults. Juvenile open-angle glaucoma can develop in children and teenagers, and secondary glaucoma can occur at any age following an eye injury, as a side effect of certain medications, or in association with other health conditions. Any concerns about a child's vision, eye appearance, or eye behavior should prompt a visit to an eye doctor for a thorough evaluation.
Protecting Your Sight with Expert Glaucoma Care
Understanding the many forms of glaucoma puts you in a much stronger position to protect your vision for the long term. Associated Eye Physicians & Surgeons is committed to providing thorough, individualized glaucoma care to patients throughout New Jersey, from early screenings and precise diagnosis to the full range of medical, laser, and surgical treatments. We encourage you to schedule a comprehensive eye exam with our team so we can evaluate your eye health and create a personalized plan to keep your vision as healthy as possible for years to come.
Dr. Hershkin was also very nice and she was super thorough. She took her time with the exam and didn't push me to do anything unnecessary. I would highly recommend Dr. Hershkin.
Veronica S.
Dr. Randa Garrana is simply exceptional! From the very beginning, she took the time to explain every detail of the LASIK procedure, ensuring I felt completely comfortable and informed. The results have been truly life-changing.
Eric J.
Everyone was helpful and courteous. I always recommend this practice to persons looking for an excellent eye care.
Benedict Emanuele
I adore Dr Khan. He has been my Dr. since 2020 and I highly recommend him to anyone. He does my regular check-ups, helps me manage my chronic eye issues, did my cataract surgeries and did my corrective lenses.
Lara Corsets
We love the Doctors and staff at Associated Eye Physicians in Belleville!! My husband and I have been patients for years with Drs. Hosler and Eileen, their assistant. I recently had cataract and retina surgery and knew l was going to be treated with the best and most compassionate care. The Doctors and staff truly care for their patients!
Kathy DeCecco