Understanding Different Types of Glaucoma
Primary Open-Angle Glaucoma
This is the most common form of glaucoma, affecting over 3 million Americans. It often develops slowly without obvious symptoms, earning it the nickname the silent thief of sight, which is why regular eye exams are crucial to catch it early.
Primary open-angle glaucoma occurs when fluid drains too slowly from the eye's drainage system, causing gradual pressure build-up inside the eye. Think of it like a sink where the drain is partially blocked. The drainage angle appears open and normal when your doctor examines it, but microscopic blockages prevent proper fluid flow. This type represents about 90 percent of all glaucoma cases and can affect one or both eyes, though it may progress at different rates in each eye.
Several factors increase your chances of developing this condition. You are at higher risk if you have any of the following:
- Age over 40, with risk increasing every decade
- Family history of glaucoma, especially in parents or siblings
- African American, Hispanic, or Asian ancestry
- High eye pressure, also known as ocular hypertension
- Thin corneas or large cup-to-disc ratios in the optic nerve
- Diabetes, high blood pressure, or heart disease
- Severe nearsightedness, also called myopia
Early stages typically show no symptoms, which makes regular eye exams essential. As the disease progresses, you may notice gradual loss of side vision, difficulty seeing in dim light, or trouble with depth perception. By the time symptoms appear, significant vision loss may have already occurred, which is why catching glaucoma early through comprehensive testing is so important.
Our ophthalmologists use several tests to detect and monitor this condition. These diagnostic tools help us understand the severity of your glaucoma and track how well your treatment is working:
- Eye pressure measurement using tonometry, which gently measures the fluid pressure inside your eye
- Optic nerve examination through dilated pupils to look for signs of damage
- Visual field testing to map your peripheral vision and detect any areas of vision loss
- Optical coherence tomography, or OCT, to measure nerve fiber thickness with detailed imaging
- Gonioscopy to examine the drainage angle where fluid leaves the eye
- Corneal thickness measurement, called pachymetry, which helps determine your risk
The goal is to lower eye pressure to prevent further optic nerve damage. Treatment is personalized based on how advanced your glaucoma is. Common options include:
- Eye drops such as prostaglandin analogs, beta-blockers, or alpha agonists that help fluid drain better or reduce fluid production
- Laser treatments like selective laser trabeculoplasty, or SLT, to improve drainage without surgery
- Minimally invasive glaucoma surgeries, or MIGS, for mild to moderate cases that use tiny implants or instruments to improve fluid flow
- Traditional surgeries like trabeculectomy for advanced cases that create a new drainage pathway for fluid
- Glaucoma drainage devices or implants when other surgeries are not suitable
Most people with well-controlled open-angle glaucoma maintain good vision and continue normal activities. Success depends on following your treatment plan, attending regular check-ups, and monitoring for any vision changes. Many patients live full, active lives with proper management and the support of their eye care team.
Angle-Closure Glaucoma
This type can cause sudden, severe increases in eye pressure and requires immediate medical attention. It accounts for about 10 percent of glaucoma cases in the United States but is more common in certain populations, particularly those of Asian, Inuit, or Hispanic descent.
Angle-closure glaucoma happens when the iris, the colored part of your eye, moves forward and blocks the eye's drainage angle, preventing fluid from leaving the eye. This blockage can develop gradually over time (chronic) or happen suddenly (acute). Acute attacks are medical emergencies that can cause permanent vision loss within hours if not treated.
Certain anatomical features and demographics increase risk. These include:
- People of Asian, Inuit, or Hispanic descent
- Women, who are affected more often than men
- Adults over 55, with risk increasing with age
- Farsighted individuals, or those with hyperopia, who have shorter, more crowded eyes
- Family history of angle-closure glaucoma
- People with cataracts that cause lens swelling
- Those taking certain medications that dilate pupils, such as some antidepressants or decongestants
Acute angle-closure attacks cause severe symptoms that require immediate emergency care. Seek help right away at an emergency room or call our office if you experience:
- Intense eye pain and headache
- Sudden blurred or decreased vision
- Seeing halos or rainbows around lights
- Red, watery eyes
- Nausea and vomiting
- An eye that feels hard to the touch
The chronic form develops slowly with mild or no symptoms, similar to open-angle glaucoma. You might experience occasional mild eye discomfort, brief episodes of blurred vision, or halos around lights, especially in dim lighting or when your pupils dilate in darkness.
Acute attacks require immediate treatment to prevent permanent vision loss. Emergency treatment involves:
- Medications to rapidly lower eye pressure
- Laser iridotomy to create a small drainage hole in the iris to restore fluid flow
- Treatment of the unaffected eye to prevent future attacks
- Surgery such as trabeculectomy or lens extraction if laser treatment is insufficient
If you are at risk for angle-closure glaucoma, our ophthalmologists may recommend preventive laser treatment. Regular monitoring helps detect gradual angle narrowing before acute attacks occur. Both eyes typically need treatment since the condition often affects both sides, and our comprehensive eye care helps ensure nothing is missed.
Normal-Tension Glaucoma
This form affects about one-third of people with open-angle glaucoma. Despite having eye pressure in the normal range, the optic nerve still becomes damaged and vision loss occurs, which is why pressure measurements alone do not define glaucoma.
Normal-tension glaucoma involves progressive optic nerve damage and vision loss even though eye pressure measurements remain within the statistically normal range, below 21 millimeters of mercury, or mmHg. The exact cause is unknown, but factors beyond eye pressure are thought to contribute to optic nerve damage, such as poor blood flow or increased sensitivity of the nerve.
Several factors may increase susceptibility to normal-tension glaucoma. These include:
- Japanese ancestry, where this type is more common
- Women, particularly after menopause
- Family history of normal-tension or low-pressure glaucoma
- History of systemic diseases affecting blood flow, such as heart disease or stroke
- Low blood pressure, especially at night
- History of vasospastic disorders such as migraine headaches or Raynaud's phenomenon
- Sleep apnea or other conditions affecting blood oxygen levels
Researchers believe several factors may contribute to optic nerve damage in normal-tension glaucoma. These factors include poor blood flow to the optic nerve, increased sensitivity of the optic nerve to pressure, and autoimmune factors that may attack nerve tissue. This complexity is why comprehensive evaluation by experienced ophthalmologists is essential.
Symptoms mirror those of regular open-angle glaucoma, with gradual peripheral vision loss that often goes unnoticed. Because eye pressure appears normal, this type may be harder to detect, which is why comprehensive eye exams that include detailed optic nerve evaluation and visual field testing are crucial for diagnosis.
Treatment strategies aim to protect the optic nerve by lowering eye pressure even further below normal levels and improving blood flow to the nerve. Our ophthalmologists tailor treatment to each patient's needs using approaches such as:
- Lowering eye pressure with eye drops
- Improving blood flow to the optic nerve through lifestyle changes or medications
- Managing blood pressure to ensure adequate optic nerve circulation
- Regular moderate exercise to improve overall circulation
- Treating underlying conditions like sleep apnea
Secondary Glaucoma
Secondary glaucoma develops when another eye condition, injury, or medication interferes with the eye's normal fluid drainage system. Unlike primary glaucoma, there is usually a clear underlying reason for the condition, which helps our ophthalmologists determine the most effective treatment approach.
Secondary glaucoma occurs when an identifiable cause disrupts normal fluid flow in the eye, leading to increased pressure and optic nerve damage. Successful treatment often requires addressing both the underlying cause and the elevated eye pressure simultaneously.
Several conditions can trigger secondary glaucoma. The most common types include:
- Inflammatory glaucoma from uveitis or other eye infections inside the eye
- Steroid-induced glaucoma from prolonged use of steroid medications applied to or in the eye
- Pigmentary glaucoma when pigment granules from the iris block drainage channels
- Pseudoexfoliation glaucoma from protein deposits in the eye that accumulate over time
- Neovascular glaucoma from abnormal blood vessel growth, often linked to diabetes or retinal problems
- Traumatic glaucoma following an eye injury
- Lens-induced glaucoma from cataract complications or a dislocated lens
Symptoms vary widely based on the underlying cause. They may include eye pain, redness, vision changes, light sensitivity, or seeing halos around lights. Some types cause gradual vision loss similar to primary glaucoma, while others may cause sudden symptoms and require emergency care.
Treatment aims to control the underlying cause and lower eye pressure. This may involve:
- Treating inflammation with anti-inflammatory medications
- Managing diabetes or other systemic diseases
- Discontinuing or reducing steroid medications when possible under medical supervision
- Using standard glaucoma medications, laser treatments, or surgery to lower eye pressure
Congenital Glaucoma
This rare condition affects about 1 in 10,000 babies and requires immediate attention to prevent permanent vision loss. Early recognition and treatment are critical for preserving a child's sight and normal visual development as they grow.
Congenital glaucoma occurs when the eye's drainage system does not develop properly before birth, causing fluid to build up and increase pressure inside the eye. The elevated pressure can damage the developing optic nerve and cause the eye to enlarge abnormally, which is sometimes visible to parents.
Parents and caregivers should watch for these warning signs in infants and young children:
- Eyes that appear unusually large or are different sizes
- Cloudy or hazy corneas
- Excessive tearing without crying
- Sensitivity to light, causing squinting or eye covering
- Frequent eye rubbing or keeping eyes closed
- Irritability that improves in dim lighting
Surgery is usually the first line of treatment for congenital glaucoma, as medications are often less effective in children. Common procedures include goniotomy to open blocked drainage channels or trabeculotomy to create new drainage pathways that allow fluid to exit the eye properly.
With early surgical treatment, many children with congenital glaucoma can develop good vision and lead normal lives. However, they require lifelong monitoring by an eye care team and may need additional treatments or surgeries as they grow and their eyes develop.
Frequently Asked Questions
Here are answers to some common questions patients ask our ophthalmologists about glaucoma and its treatment.
Currently, there is no cure for glaucoma, but it can be successfully managed to prevent or slow further vision loss. With proper treatment, most people with glaucoma maintain good, functional vision throughout their lives. This is why consistent treatment and regular monitoring are so important.
Adults over 40 should have comprehensive eye exams every one to two years. If you have a family history or other risk factors, our ophthalmologists may recommend more frequent screening. People diagnosed with glaucoma typically need check-ups every three to six months, depending on how well their condition is controlled and the treatment plan.
While lifestyle changes cannot prevent glaucoma, healthy habits can support overall eye health. Regular moderate exercise, a diet rich in leafy greens and omega-3 fatty acids, not smoking, limiting caffeine, managing stress, and maintaining healthy blood pressure can all be beneficial additions to your medical treatment.
Most people can continue their normal activities. However, you should avoid activities that put your head in a downward position for extended periods, such as certain yoga poses or inversions, and avoid lifting extremely heavy weights. Discuss specific concerns with your ophthalmologist to ensure you can continue activities you enjoy safely.
Early-stage glaucoma usually does not affect driving. However, advanced cases with significant peripheral vision loss may impact driving safety. Our ophthalmologists can assess whether your vision meets legal driving requirements and advise you about driving safety.
Yes, family history significantly increases your risk. First-degree relatives of someone with glaucoma have a four to nine times higher chance of developing the condition. If you have a family history of glaucoma, you should have regular comprehensive eye exams to catch any problems early.
Missing an occasional dose is usually not harmful, but consistency is key. Try to take a missed dose as soon as you remember, but do not double up on doses. If you frequently forget, talk to your doctor about reminder strategies, using pill organizers, or trying longer-acting medications or laser treatments that require less frequent maintenance.
Yes, children can develop juvenile glaucoma, which appears after infancy but before adulthood. They can also develop secondary glaucoma from eye injuries, medications, or other health conditions. Any vision concerns in a child should be evaluated promptly by an eye doctor.
Your eye doctor monitors treatment success through regular eye pressure checks, optic nerve examinations, and visual field tests. Stable test results over time indicate that the treatment is effectively controlling the disease. It is important to attend all follow-up appointments even if you feel fine, because glaucoma has no symptoms until significant damage has occurred.
Yes, research is very active. Recent advancements include minimally invasive glaucoma surgeries, or MIGS, which use tiny implants and smaller incisions, improved laser therapies, and sustained-release drug delivery implants that reduce the need for daily eye drops. Future treatments being explored include neuroprotective drugs, gene therapies, and stem cell treatments that may slow or prevent nerve damage.
If left untreated, glaucoma can eventually cause complete blindness. However, this outcome is preventable with early detection and proper, consistent care. Even with significant vision loss, most people retain some central vision, and ongoing treatment helps preserve remaining sight.
Sudden severe eye pain, rapid vision loss, or seeing halos around lights could indicate an acute glaucoma attack or another serious eye emergency. You should seek immediate medical attention at an emergency room or contact an eye doctor right away. Do not wait for an appointment.
In addition to measuring eye pressure, doctors use imaging tests like optical coherence tomography, or OCT, to see the optic nerve in high detail, fundus photography to document its appearance over time, and visual field testing to map any peripheral vision loss. Together, these tests help our ophthalmologists diagnose glaucoma and monitor your condition.
Yes, medication choice depends on the type of glaucoma and your individual health. For example, prostaglandin analogs are often a first choice for open-angle glaucoma. Your ophthalmologist will tailor the treatment to your specific needs and adjust it based on how well your eye pressure is controlled.
Without treatment, the progressive damage to the optic nerve from glaucoma can cause irreversible vision loss and eventually lead to blindness. Early diagnosis and management are the only ways to prevent these serious outcomes and preserve your sight for the future.
Primary open-angle glaucoma, the most common type, is typically painless. However, some forms of secondary glaucoma or chronic angle-closure glaucoma can cause intermittent discomfort, pressure, or mild pain that should be evaluated by your eye doctor.
Most glaucoma surgeries work by creating a new drainage pathway or improving the existing one to help fluid exit the eye more efficiently. This lowers the internal eye pressure, which reduces stress on the optic nerve and helps preserve remaining vision. Different surgeries work in different ways depending on the type of glaucoma and severity.
Yes, patient education and support groups can provide valuable information, coping strategies, and peer support. Organizations like the Glaucoma Research Foundation and the American Academy of Ophthalmology offer many resources for patients and families dealing with glaucoma.
Protecting Your Vision at ReFocus Eye Health Hatboro
Understanding the different types of glaucoma empowers you to work effectively with our ophthalmologists at ReFocus Eye Health Hatboro to protect your vision. Whether you are a patient in Hatboro, Warminster, Southampton, or Abington, or you come to us from the broader Greater Philadelphia Metropolitan Area, our comprehensive eye care team is here to help. Regular eye exams, following your treatment plan, and staying informed about your condition are the best ways to maintain healthy eyesight and quality of life for years to come.
Dr. Clark, and team are professional, caring, and dedicated. Treating my wife for quite some time with her glaucoma and laser surgery of her eyes. Truly a great care of my wife's and my vision!
M.P
Doctor Aikey was very engaged and friendly. I like to research my diagnosis/issue and Dr. Aikey welcomed my many inquiries and responded appropriately. I liked him very much.
Bobbi Toner
Dr Martinez is detail oriented and explained risks and benefits for patient understanding. She took the extra time necessary to obtain quality assessments and explained while doing so.
Ann Warner
Had an amazing cataract surgery with femto laser & symphony lens by Dr. Clark. Superwoman now! He’s rare, spends time, builds trust. Life quality improved greatly. Highly recommend!
Helene Senior
Very little wait time today. Staff was very friendly & efficient. Dr. Martinez always puts me at ease and answers all my questions. Highly recommend her.
Alice Murray
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