Acute Congestive Glaucoma: Definition, Causes, Symptoms, and Treatment

Acute congestive glaucoma is a sudden and severe form of glaucoma that can cause rapid vision loss if not treated promptly. Characterised by increased intraocular pressure, it often presents with eye pain, redness, and blurred vision. 

Early diagnosis and treatment are critical to prevent permanent optic nerve damage. In this blog, we will walk you through acute congestive glaucoma, its causes, symptoms, diagnosis, and when to see a doctor. Since conditions like cataract or retinal detachment can also threaten eyesight, understanding the differences and seeking timely care is essential

What is Acute Congestive Glaucoma?

Acute congestive glaucoma (acute angle-closure glaucoma) is an acute event in which intraocular pressure (IOP) rises significantly. This pressure causes the drainage angle of the eye to be blocked. 

This blockage limits the normal outflow of aqueous humour- a fluid that feeds the eye and gives it shape. Failure to treat this condition in time may result in permanent loss of vision in a few hours to days. Unlike other types of glaucoma that progress slowly, this condition demands immediate medical attention to prevent permanent vision loss.

Causes of Acute Congestive Glaucoma

Anatomical Factors

Individuals with anatomically narrow angles are more prone to this type of glaucoma. Factors such as a smaller anterior chamber, a thicker lens, or a shallow corneal angle can increase the risk of blockage in the drainage system of the eye.

High Intraocular Pressure (IOP)

An abrupt increase in intraocular pressure is the defining feature of acute congestive glaucoma. The pressure rises rapidly when aqueous humour is unable to drain through the trabecular meshwork due to angle closure.

Lens Displacement

Dislocation or swelling of the natural lens can cause it to press forward against the iris, narrowing or closing the drainage angle and triggering an acute attack.

Eye Trauma or Injury

Physical trauma to the eye can disrupt the delicate structures responsible for fluid drainage, leading to sudden IOP spikes and acute glaucoma symptoms.

Tumors

Rarely, intraocular tumours can distort anatomical structures, leading to secondary angle closure and increased intraocular pressure.

Symptoms of Acute Congestive Glaucoma

Severe Eye Pain

Pain is usually sudden and intense, often described as a deep ache in or around the affected eye.

Blurred Vision

The rise in IOP can cause corneal oedema (swelling), resulting in hazy or blurry vision.

Nausea and Vomiting

Due to the severity of the pain and pressure, patients may experience systemic symptoms like nausea or even vomiting.

Redness of the Eye

The affected eye often appears red and inflamed due to the increased pressure and congestion of blood vessels.

Rainbow Halos Around Lights

Patients may see coloured rings or halos around lights, especially in dim lighting, due to corneal swelling and light diffraction.

Diagnosis of Acute Congestive Glaucoma

Prompt and accurate diagnosis is essential for effective treatment. The following clinical tests are commonly used:

Visual Acuity Test

This standard test helps evaluate the extent of vision impairment caused by increased intraocular pressure.

Tonometry

This test measures intraocular pressure and is crucial for confirming glaucoma. A significant elevation usually indicates acute glaucoma.

Gonioscopy

A gonioscope is used to visualise the drainage angle of the eye, helping determine if the angle is closed, which confirms the diagnosis of angle-closure glaucoma.

Retinal Examination

An ophthalmologist will examine the retina and optic nerve for any signs of damage caused by elevated IOP, which can guide further management.

Preventing Acute Congestive Glaucoma Attacks

While not all causes can be prevented, especially anatomical ones, certain precautions can reduce the risk of attacks.

Regular Eye Examinations

Routine comprehensive eye exams can detect narrow angles before symptoms occur. This allows preventive interventions such as laser iridotomy.

Proactive Medication Use

Patients at risk may be advised to use prescribed medications to manage eye pressure and delay or prevent acute episodes.

Avoiding Triggers

Certain medications, such as antihistamines or decongestants, can precipitate attacks by dilating the pupils. Patients with narrow angles should consult their ophthalmologist before using such drugs.

When to See a Doctor for Acute Congestive Glaucoma

Immediate medical attention is essential if you experience symptoms such as sudden eye pain, blurred vision, or rainbow halos. Delaying treatment can lead to irreversible vision loss. Individuals with a family history of glaucoma or those diagnosed with narrow angles during routine exams should schedule regular follow-ups with a glaucoma specialist.