Normal tension glaucoma: diagnostic features and comparisons with primary open angle glaucoma.

Area of Science:

• Ophthalmology
• Neuroscience

Background:

• Normal tension glaucoma (NTG) is often misdiagnosed as primary open angle glaucoma (POAG).
• NTG presents diagnostic challenges due to overlapping clinical features with POAG.
• The etiology of NTG may differ from POAG, with less emphasis on intraocular pressure (IOP).

Purpose of the Study:

• To review the epidemiology and clinical features of NTG.
• To explore potential differences between NTG and POAG for diagnostic differentiation.
• To discuss the pathophysiology of NTG, including apoptosis, axonal damage, and neuroprotection.

Main Methods:

• Literature review focusing on NTG epidemiology and clinical presentation.
• Comparative analysis of NTG and POAG features.
• Discussion of current research on NTG pathophysiology.

Main Results:

• NTG develops with minimal contribution from IOP.
• Clinical differentiation between NTG and POAG remains difficult.
• Diagnosis accuracy may improve with a higher number of presenting signs.
• NTG with higher IOP ( > 15 mmHg) may progress faster.

Conclusions:

• NTG is a distinct glaucoma entity where IOP is not the primary driver.
• Accurate diagnosis of NTG requires careful evaluation and consideration of multiple clinical signs.
• Clinicians must maintain a high index of suspicion for NTG, especially when typical IOP markers are absent.