Summary:
- Primary open-angle and normal-tension glaucoma are usually asymptomatic.
- Glaucoma typically affects your peripheral vision first, gradually damaging the optic nerve.
- If you’re over 40, have high myopia, or other risk factors, a regular glaucoma screening in Singapore is recommended.
Does Glaucoma Always Cause Symptoms? Why Early Damage Often Goes Unnoticed
Glaucoma refers to a group of eye conditions that affect the optic nerve. It can develop in different ways, depending on the underlying cause. Some forms progress slowly and without obvious symptoms, while others can cause sudden and severe discomfort.
So, what type of glaucoma is usually asymptomatic? And when should you go for a glaucoma screening in Singapore? Read on for the answers.
Why Early Glaucoma Often Has No Symptoms
The changes happening inside your eye can be subtle, affecting areas of vision you may not actively rely on. This is why early damage can progress without obvious warning signs.
Several factors contribute to this silent progression.
Peripheral Vision Is Affected First
Glaucoma typically affects peripheral (side) vision before central vision.
- Central vision is what you use to read, recognise faces, and focus on objects directly in front of you.
- Peripheral vision helps you detect movement and maintain spatial awareness.
Because central vision remains clear in the early stages, you may not notice small gaps developing at the edges of your visual field until it’s more serious.
The Brain Compensates for Missing Areas
When small blind spots develop, your brain can “fill in” the missing information using surrounding visual cues. As a result, you may not notice the gradual changes in your peripheral vision until a specialist detects them during an eye exam, or when your vision is significantly impaired.
The Optic Nerve Itself Does Not Feel Pain
Slow damage to the optic nerve doesn’t usually cause discomfort because it doesn’t have pain fibres. When eye pressure increases slowly, there may be no redness, no aching, and no obvious changes to your sight.
Who Is Most at Risk of Silent Progression?
You may be at higher risk if you:
- Are over 40
- Have a family history of glaucoma
- Have high myopia, as the optic nerve may be more vulnerable to damage
- Have diabetes or other vascular conditions that may reduce circulation to the optic nerve
- Use long-term steroid medication, which can gradually raise eye pressure
- Have had previous eye injury or surgery, as these can alter how fluid drains inside the eye
Because early glaucoma can be asymptomatic, Lumin Eye Specialists recommend you go for an eye screening in Singapore to confirm or rule out the condition.
Which Types of Glaucoma Are Usually Asymptomatic?
Some types develop gradually and are often detected only during routine eye examinations.
Primary Open-Angle Glaucoma
This type of glaucoma develops slowly when the eye’s drainage system becomes less efficient over time. Fluid does not drain properly, causing pressure to build up gradually.
As a result, there’s usually no pain, redness, or sudden change in vision. Peripheral vision is affected first, while central vision remains clear.
Normal-Tension Glaucoma
Normal-tension glaucoma is a type of open-angle glaucoma where optic nerve damage occurs even though eye pressure remains within the normal range.
The progression is typically slow and painless, similar to primary open-angle glaucoma. Vision changes develop gradually and may not be noticeable in the early stages.
When Glaucoma Does Cause Symptoms
When pressure inside the eye rises rapidly, symptoms are more likely to occur.
Acute Angle-Closure Glaucoma
This is when the drainage angle inside the eye becomes suddenly blocked and pressure rises quickly, causing:
- Severe eye pain
- Redness in the eyes
- Headache
- Blurred vision
- Halos around lights
- Nausea
- Vomiting
If you develop these symptoms, don’t wait for them to settle on their own. Acute angle-closure glaucoma requires urgent treatment to lower eye pressure and protect your sight.
Congenital Glaucoma
This type of glaucoma affects infants and young children, and it’s typically due to the abnormal development of the eye’s drainage system.
Because the eye is still developing, signs may be more noticeable, such as:
- Enlarged eyes
- Excessive tearing
- Sensitivity to light
- Cloudy cornea
If you’re a parent and you observe your child with any of the above, arrange an eye examination promptly.
How Glaucoma Is Detected Before You Notice Vision Loss
We can diagnose glaucoma through several screening tests in Singapore.
Measuring Eye Pressure
We’ll measure the pressure inside your eye through a test known as tonometry. Elevated eye pressure increases the risk of optic nerve damage, although glaucoma can still occur even when pressure is within the normal range.
Examining the Optic Nerve
Your optic nerve can be examined using specialised instruments after dilating your pupils. We’ll look for changes in the shape and structure of the nerve that may suggest early damage.
Visual Field Testing
A visual field test checks your peripheral vision, and we use it to detect blind spots that you may not be aware of, especially in the early stages of glaucoma. During the test, we’ll ask you to respond to small lights appearing in different areas of your visual field.
Imaging Scans (OCT)
Optical coherence tomography (OCT) is a scan that provides detailed images of the optic nerve and surrounding nerve fibres. It allows us to measure and monitor thinning over time.
Screen for Glaucoma, Even Without Symptoms
If you fall into a higher-risk group or have not had an eye check recently, Lumin Eye Specialists recommend a comprehensive glaucoma screening in Singapore.
Frequently Asked Questions
How often should glaucoma screening in Singapore be done?
Most adults over 40 should have their eyes checked every one to two years. If you have risk factors such as a family history or high myopia, Lumin Eye Specialists may recommend more frequent reviews.
Should I worry if I am a glaucoma suspect?
Being at risk for glaucoma doesn’t necessarily mean you have it. We recommend monitoring any subtle changes in your vision and coming in for an eye assessment regularly.
What is the first stage of glaucoma?
The first stage of glaucoma involves early optic nerve damage. Your vision usually feels normal at this stage, and changes are detected through testing.
Book an Eye Examination and Detect Glaucoma Early
Glaucoma often develops silently, with little to no early symptoms. Regular eye exams are essential for early detection and preventing irreversible vision loss.