Understanding Glaucoma: Causes, Symptoms, and Why Early Detection Matters

Glaucoma is one of the leading causes of irreversible vision loss worldwide. Often called the “silent thief of sight,” glaucoma can damage the optic nerve gradually without noticeable symptoms in its early stages.

Because the condition develops slowly, many people may not realise they have glaucoma until vision loss has already occurred. Early detection through regular eye examinations is therefore essential to protect long-term vision.

At iSurgeon, advanced diagnostic technology and specialist ophthalmic care help detect glaucoma early and manage the condition effectively.

What Is Glaucoma?

Glaucoma refers to a group of eye diseases that damage the optic nerve, the structure responsible for transmitting visual information from the eye to the brain.

This damage is often associated with increased pressure inside the eye, known as intraocular pressure (IOP). When eye pressure becomes too high, it can gradually damage the optic nerve fibres responsible for vision.

If left untreated, glaucoma can lead to permanent vision loss or blindness.

Types of Glaucoma

Several types of glaucoma exist, but the most common include:

Primary Open-Angle Glaucoma

This is the most common form of glaucoma. It develops slowly and usually has no early warning signs. Vision loss begins in the peripheral (side) vision and may go unnoticed for years.

Angle-Closure Glaucoma

Angle-closure glaucoma occurs when the drainage angle of the eye suddenly becomes blocked, causing a rapid increase in eye pressure. This type requires urgent medical treatment.

Secondary Glaucoma

Secondary glaucoma develops as a result of another eye condition, injury, medication, or disease affecting the eye.

Congenital Glaucoma

This rare form affects infants and children and is caused by abnormal development of the eye’s drainage system.

Symptoms of Glaucoma

In many cases, glaucoma develops without noticeable symptoms in the early stages.

As the condition progresses, symptoms may include:

• Gradual loss of peripheral vision
• Tunnel vision in advanced stages
• Eye pain or pressure (in some forms)
• Blurred vision
• Halos around lights
• Sudden vision disturbance (in acute cases)

Because symptoms may not appear until damage has occurred, regular eye examinations are the best way to detect glaucoma early.

Risk Factors for Glaucoma

Several factors increase the risk of developing glaucoma:

• Age over 40
• Family history of glaucoma
• High eye pressure
• Diabetes or high blood pressure
• Previous eye injury
• Long-term steroid medication use
• African ancestry

Individuals with one or more risk factors should prioritise routine eye screenings.

Why Early Detection Is Critical

Damage caused by glaucoma cannot be reversed, but early treatment can prevent further vision loss.

Comprehensive eye examinations can detect glaucoma long before symptoms appear, allowing ophthalmologists to begin treatment and protect remaining vision.

At iSurgeon, advanced diagnostic imaging helps identify early optic nerve damage and monitor disease progression.