Which type of glaucoma is considered symptomless?

Open angle glaucoma is often referred to as "silent" or "symptomless" because it typically progresses gradually over time without noticeable symptoms. Patients often do not experience any pain or noticeable changes in vision until the condition has reached an advanced stage. This is why it is sometimes called the "sneak thief of sight."

In the case of open angle glaucoma, the intraocular pressure may be elevated, but individuals may not recognize any visual disturbance until significant damage to the optic nerve has occurred. Regular eye exams are crucial for detection, as the disease can lead to irreversible vision loss if left untreated.

In contrast, acute angle closure glaucoma usually presents with sudden symptoms such as severe eye pain, nausea, and vomiting, which is recognizable as an eye emergency. Normal tension glaucoma can also occur without initial symptoms, but it still often involves some noticeable loss of vision over time, albeit at lower pressure. Secondary glaucoma arises due to other medical conditions or medications and may present with symptoms related to the underlying cause. Thus, open angle glaucoma is the primary type that remains symptomless in its early stages.