Understanding the Different Types of Glaucoma
Primary Open-Angle Glaucoma
This is the most common form of glaucoma, affecting over 4 million Americans. It develops slowly without obvious symptoms, which is why we call it the silent thief of sight and why regular eye exams are so important.
Primary open-angle glaucoma occurs when fluid drains too slowly from your eye's natural drainage system. The drainage angle looks open and normal, but tiny blockages prevent fluid from flowing properly. Pressure builds up gradually inside your eye. 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 face 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 called ocular hypertension
- Thin corneas or large cup-to-disc ratios in your optic nerve
- Diabetes, high blood pressure, or heart disease
- Severe nearsightedness
Early stages typically show no symptoms, which is why we recommend regular comprehensive eye exams. As the disease progresses, you may notice gradual loss of your side vision, difficulty seeing in dim light, or trouble judging distances. By the time you notice symptoms, significant vision loss may have already occurred. That is why our team emphasizes prevention through routine screenings.
Our ophthalmologists use several advanced tests to detect and monitor this condition. These tests include:
- Eye pressure measurement using tonometry
- Optic nerve examination through dilated pupils
- Visual field testing to map your peripheral vision
- Optical coherence tomography (OCT) to measure nerve fiber thickness
- Gonioscopy to examine your drainage angle
- Corneal thickness measurement, also called pachymetry
Our goal is to lower your eye pressure to prevent further optic nerve damage. We tailor treatment to your specific needs and may recommend:
- Prescription eye drops such as prostaglandin analogs, beta-blockers, or alpha agonists
- Laser treatments like selective laser trabeculoplasty (SLT) to improve drainage
- Minimally invasive glaucoma surgeries (MIGS) for mild to moderate cases
- Traditional surgeries like trabeculectomy for advanced cases
- Glaucoma drainage devices or implants when other surgeries are not suitable
Most people with well-controlled open-angle glaucoma maintain good vision and continue their normal activities. Success depends on following your treatment plan, attending regular check-ups with our team, and monitoring for any vision changes. Many of our patients live full, active lives with proper management.
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.
Angle-closure glaucoma happens when your iris moves forward and blocks your eye's drainage angle. This prevents fluid from leaving your eye properly. The blockage can be gradual, which we call chronic, or sudden, which we call acute. Acute attacks are medical emergencies that can cause permanent vision loss within hours if not treated immediately.
Certain physical features and demographics increase your risk for this type. 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 with shorter, more crowded eyes
- Family history of angle-closure glaucoma
- People with cataracts that cause the lens to swell
- 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 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. These symptoms often occur in dim lighting or when your pupils dilate naturally.
Acute attacks require immediate treatment to prevent permanent vision loss. Our emergency treatment approach involves:
- Medications to rapidly lower your eye pressure
- Laser iridotomy to create a small drainage hole in your iris that restores fluid flow
- Treatment of your unaffected eye to prevent future attacks
- Surgery such as trabeculectomy or lens extraction if laser treatment is not sufficient
If you are at risk for angle-closure glaucoma, we may recommend preventive laser treatment. Regular monitoring helps us detect gradual angle narrowing before acute attacks occur. Both eyes typically need treatment since the condition often affects both sides.
Normal-Tension Glaucoma
This form affects about one-third of people with open-angle glaucoma. Despite having eye pressure in the normal range, your optic nerve still becomes damaged and vision loss occurs.
Normal-tension glaucoma involves progressive optic nerve damage and vision loss even though your eye pressure measurements remain within the normal range, which is below 21 mmHg. The exact cause is unknown, but we believe factors beyond eye pressure contribute to optic nerve damage in these cases.
Several factors may increase your 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 diseases that affect blood flow throughout your body
- Low blood pressure, especially at night
- History of vasospastic conditions such as migraine headaches or Raynaud's phenomenon
- Sleep apnea or other conditions that affect your blood oxygen levels
Our researchers believe several factors may contribute to optic nerve damage in normal-tension glaucoma. These include poor blood flow to your optic nerve, increased sensitivity of your optic nerve to pressure, and possible autoimmune factors that may attack nerve tissue. We continue to study these mechanisms to develop better treatments.
Symptoms mirror those of regular open-angle glaucoma, with gradual peripheral vision loss that often goes unnoticed at first. Because eye pressure appears normal, this type may be harder to detect. This emphasizes the importance of comprehensive eye exams that include detailed optic nerve evaluation and visual field testing, not just pressure checks.
Our treatment strategies aim to protect your optic nerve by lowering eye pressure even further below normal levels and improving blood flow. We may recommend:
- Lowering your eye pressure with prescription eye drops
- Improving blood flow to your optic nerve through lifestyle changes or medications
- Managing your 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 your eye's normal fluid drainage system. Unlike primary glaucoma, there is usually a clear underlying reason for the condition.
Secondary glaucoma occurs when an identifiable cause disrupts normal fluid flow in your eye, leading to increased pressure and optic nerve damage. Successful treatment often requires addressing both the underlying cause and the elevated eye pressure. We work closely with you to identify and treat the root cause.
Several conditions can trigger secondary glaucoma. The most common types we see include:
- Inflammatory glaucoma from uveitis or other eye infections
- Steroid-induced glaucoma from prolonged use of steroid medications
- Pigmentary glaucoma when pigment granules from your iris block drainage channels
- Pseudoexfoliation glaucoma from protein deposits in your eye
- Neovascular glaucoma from abnormal blood vessel growth, often linked to diabetes
- Traumatic glaucoma following an eye injury
- Lens-induced glaucoma from cataract complications or a dislocated lens
Symptoms vary widely based on the underlying cause. You may experience eye pain, redness, vision changes, sensitivity to light, or seeing halos around lights. Some types cause gradual vision loss similar to primary glaucoma, while others may cause sudden symptoms that need immediate attention.
Our treatment aims to control the underlying cause and lower your eye pressure. This may involve:
- Treating inflammation with anti-inflammatory medications
- Managing diabetes or other systemic diseases through our diabetic eye care services
- Discontinuing or reducing steroid medications when possible, working with your other doctors
- Using standard glaucoma medications, laser treatments, or surgery to lower your 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 development.
Congenital glaucoma occurs when your baby's eye drainage system does not develop properly before birth. This causes 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 the first visible sign.
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 covering eyes
- Frequent eye rubbing or keeping eyes closed
- Irritability that improves in dim lighting
Surgery is usually the first line of treatment for congenital glaucoma because medications are often less effective in young children. Common procedures include goniotomy to open blocked drainage channels or trabeculotomy to create new drainage pathways. Our team works closely with pediatric specialists to provide the best care.
With early surgical treatment, many children with congenital glaucoma can develop good vision and lead normal lives. However, they require lifelong monitoring by our eye care team and may need additional treatments or surgeries as they grow. We provide comprehensive children's vision services to support these patients throughout their development.
Frequently Asked Questions
Here are answers to common questions we hear from our patients about glaucoma.
Currently, there is no cure for glaucoma, but we can successfully manage it to prevent or slow further vision loss. With proper treatment and regular monitoring at our practice, most people with glaucoma maintain good, functional vision throughout their lives.
We recommend that adults over 40 have comprehensive eye exams every one to two years. If you have a family history or other risk factors, we may recommend more frequent screenings. Patients diagnosed with glaucoma typically need check-ups every three to six months so we can monitor their condition closely.
While lifestyle changes cannot prevent glaucoma, healthy habits can support your overall eye health. We recommend regular moderate exercise, a diet rich in leafy greens and omega-3 fatty acids, avoiding smoking, limiting caffeine intake, and managing stress. These habits benefit your whole body, including your eyes.
Most people can continue their normal activities without restrictions. However, you should avoid activities that put your head in a downward position for extended periods, such as certain yoga poses like headstands. You should also avoid lifting extremely heavy weights that strain your body. Discuss any specific activity concerns with our team during your visit.
Early-stage glaucoma usually does not affect driving safety. However, advanced cases with significant peripheral vision loss may impact your ability to drive safely. We can assess whether your vision meets legal driving requirements and provide guidance specific to your situation.
Yes, family history significantly increases your risk for developing glaucoma. First-degree relatives of someone with glaucoma have a four to nine times higher chance of developing the condition themselves. If you have a family history, you should have regular comprehensive eye exams so we can detect any changes early.
Missing an occasional dose is usually not harmful, but consistency is essential for good control. Try to take a missed dose as soon as you remember, but never double up on doses. If you frequently forget your drops, talk to us about reminder strategies or longer-acting medications that may work better for your schedule.
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 through our children's vision services.
We monitor your treatment success through regular eye pressure checks, detailed optic nerve examinations, and visual field tests. Stable test results over time indicate that your treatment is effectively controlling the disease. It is important to attend all follow-up appointments even if you feel fine, because glaucoma damage can progress without symptoms.
Yes, glaucoma research is very active and advancing rapidly. Recent developments include minimally invasive glaucoma surgeries (MIGS) that offer effective pressure reduction with faster recovery, improved laser therapies, and sustained-release drug delivery implants that reduce the need for daily eye drops. We stay current with these advances to offer our patients the most effective treatment options.
If left untreated, glaucoma can eventually cause complete blindness. However, this outcome is preventable with early detection and proper, consistent care. Even patients with significant vision loss typically retain some central vision. This is why we emphasize the importance of regular screenings and treatment adherence.
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. Our practice provides eye emergency services, or you can go to the nearest emergency room if we are not available.
In addition to measuring your eye pressure, we use advanced imaging tests to get a complete picture of your eye health. Optical coherence tomography (OCT) lets us see your optic nerve in high detail and measure nerve fiber thickness. We also use fundus photography to document your optic nerve appearance over time and visual field testing to map any peripheral vision loss you may have.
Yes, medication choice depends on your type of glaucoma and your individual health profile. For example, prostaglandin analogs are often our first choice for open-angle glaucoma because they work well with once-daily dosing. Our ophthalmologists will tailor your treatment to your specific needs and adjust it based on how well you respond.
Without treatment, the progressive damage to your optic nerve from glaucoma causes irreversible vision loss and can eventually lead to blindness. The vision you lose cannot be restored, which is why early diagnosis and consistent management are the only ways to prevent these serious outcomes. Regular eye exams are your best protection.
Primary open-angle glaucoma, the most common type, is typically painless throughout its course. However, some forms of secondary glaucoma or chronic angle-closure glaucoma can cause intermittent discomfort, a feeling of pressure, or mild pain. Any persistent eye discomfort should be evaluated by our team.
Most glaucoma surgeries work by creating a new drainage pathway or improving your existing drainage system to help fluid exit your eye more efficiently. This lowers the internal eye pressure, which reduces stress on your optic nerve and helps preserve your remaining vision. The specific procedure we recommend depends on your type and severity of glaucoma.
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. We can also connect you with local support resources in the Camden and Philadelphia area.
Protecting Your Vision at ReFocus Eye Health Camden
Understanding the different types of glaucoma empowers you to take an active role in protecting your vision. For over 65 years, we have helped patients in Camden and the greater Philadelphia area maintain healthy eyesight through comprehensive glaucoma care. Regular eye exams, following your personalized treatment plan, and staying informed about your condition are the best ways to preserve your vision and quality of life for years to come. Schedule your comprehensive eye exam with our team today to protect your sight.
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