In people with POAG, blurring and distortion start in the side vision or peripheral vision. During its early stages, POAG would manifest minor to no symptoms.
Types of Glaucoma: Angle-Closure Glaucoma
Angle Closure Glaucoma, also called narrow-angle glaucoma, is an uncommon type of glaucoma wherein the angle between the iris and the cornea is closed or too narrow that it blocks or disrupts the normal flow in the eye’s drainage system.
Compared to POAG, angle-closure glaucoma develops relatively quickly and has very noticeable symptoms such as sudden blurry vision, eye redness, vomiting, and severe eye pain. Angle-closure glaucoma can either be acute or chronic.
- Acute Angle Closure Glaucoma. This type of glaucoma has a sudden onset of symptoms known as acute angle-closure attack and is treated as a medical emergency. The rapid increase of pressure inside the eye can cause blindness in a matter of hours.
- Chronic Angle Closure Glaucoma. This type of glaucoma progresses slowly and does not usually have any symptoms until the person will have an acute-angle closure attack. Around 30% of people with acute angle-closure glaucoma will have an attack.
Types of Glaucoma: Normal-Tension Glaucoma
Normal-tension glaucoma, also known as low-tension glaucoma, is a type of disease wherein the pressure inside the eye is normal, but there is deterioration and damage in the optic nerve due to decreased blood flow. One out of three patients who are diagnosed with open-angle glaucoma has the low-tension type.
The cause of normal-tension glaucoma is not yet well understood but it is speculated that this type of glaucoma can be due to medical conditions that impaired blood circulation.
Just like POAG, normal-tension glaucoma barely manifests any symptoms and only becomes noticeable during its advanced stages. People who have heart problems, low blood pressure, and of Japanese ancestry are prone to having normal-tension glaucoma.