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Glaucoma: Types, Symptoms, and the Importance of Regular Screenings


Glaucoma is a group of eye conditions that can cause optic nerve damage, potentially leading to vision loss or blindness. Often referred to as the "silent thief of sight," glaucoma can progress without noticeable symptoms until significant damage has occurred. Understanding the types, symptoms, and the crucial role of regular screenings can help in early detection and effective management of this condition.


What is Glaucoma?
Glaucoma is characterized by increased pressure within the eye, known as intraocular pressure (IOP), which can damage the optic nerve. The optic nerve is essential for transmitting visual information from the eye to the brain. When damaged, it can result in vision impairment or loss. There are several types of glaucoma, each with unique characteristics and risk factors.


Types of Glaucoma

1. Primary Open-Angle Glaucoma (POAG)
This is the most common type of glaucoma. It occurs when the drainage canals in the eye become clogged over time, leading to increased eye pressure. POAG develops slowly and painlessly, making it hard to notice symptoms until significant vision loss occurs.

2. Angle-Closure Glaucoma
Also known as closed-angle or narrow-angle glaucoma, this type occurs when the iris bulges forward, narrowing or blocking the drainage angle formed by the cornea and iris. This blockage can cause a rapid increase in eye pressure, leading to a sudden and severe attack known as an acute angle-closure glaucoma attack.

3. Normal-Tension Glaucoma
In normal-tension glaucoma, optic nerve damage occurs despite having normal eye pressure. The exact cause is unknown, but it may be related to poor blood flow to the optic nerve.

4. Secondary Glaucoma
This type results from another medical condition, such as inflammation, trauma, or the use of certain medications. Secondary glaucoma can occur in one or both eyes.

5. Congenital Glaucoma
Congenital glaucoma is a rare form that occurs in infants and young children. It is usually due to an abnormality in the eye's drainage system that is present at birth.


Symptoms of Glaucoma
The symptoms of glaucoma vary depending on the type and stage of the condition. Common symptoms include:


Primary Open-Angle Glaucoma

  • Gradual loss of peripheral vision, usually in both eyes

  • Tunnel vision in advanced stages

Angle-Closure Glaucoma

  • Severe eye pain

  • Nausea and vomiting

  • Sudden onset of visual disturbance, often in low light

  • Blurred vision

  • Halos around lights

  • Reddening of the eye

Normal-Tension Glaucoma

  • Symptoms are similar to POAG, with gradual vision loss


Congenital Glaucoma

  • Cloudy, enlarged, or bulging eyes

  • Excessive tearing

  • Sensitivity to light


If you experience any of these symptoms, especially sudden and severe ones, seek immediate medical attention.



The Importance of Regular Screenings
Regular eye screenings are essential for detecting glaucoma early, especially since symptoms can be subtle or non-existent in the initial stages. Early detection is crucial for preventing significant optic nerve damage and vision loss.


Who Should Get Screened?

  • Individuals over 40: The risk of glaucoma increases with age.

  • People with a family history of glaucoma: Genetics play a significant role.

  • Individuals with high intraocular pressure: Regular monitoring is essential.

  • Ethnic Groups at Higher Risk: African Americans, Asians, and Hispanics have higher risks of certain types of glaucoma.

  • People with medical conditions: Conditions like diabetes and high blood pressure can increase the risk.

  • Those with previous eye injuries: Trauma to the eye can lead to secondary glaucoma.

Screening Methods

  • Tonometry: Measures the pressure inside the eye.

  • Ophthalmoscopy: Examines the shape and color of the optic nerve.

  • Perimetry: Tests the complete field of vision.

  • Gonioscopy: Inspects the drainage angle of the eye.

  • Pachymetry: Measures the thickness of the cornea.


Treatment Options
While glaucoma cannot be cured, it can be managed effectively to prevent further vision loss. Treatment options include:


Eye drops or oral medications can help reduce eye pressure by decreasing fluid production or improving drainage.


Laser Therapy
Laser treatments like trabeculoplasty, iridotomy, or cyclophotocoagulation can help improve fluid drainage from the eye.

In cases where medications and laser therapy are ineffective, surgical procedures such as trabeculectomy, drainage implants, or minimally invasive glaucoma surgeries (MIGS) may be necessary.


Glaucoma is a serious eye condition that requires vigilant monitoring and management. Regular screenings are vital for early detection, especially since glaucoma can progress without obvious symptoms. By understanding the types, symptoms, and importance of regular eye check-ups, individuals can take proactive steps to protect their vision and maintain eye health.

For more information on eye health and to schedule an eye exam at Hillside Optometry in Granada Hills, call us at 818-474-2020, 

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