- Primary Open-Angle Glaucoma: Slow clogging of the drainage canals, leading to increased eye pressure. Gradual and often asymptomatic until advanced stages.
- Angle-Closure Glaucoma: The iris bulges forward, narrowing or blocking the drainage angle formed by the cornea and iris. Rapid, with sudden symptoms, requiring immediate medical attention.
- Normal-Tension Glaucoma: Damage to the optic nerve despite normal IOP levels. Similar to open-angle glaucoma but without elevated IOP.
- Congenital Glaucoma: A rare condition present at birth due to improper development of the eye’s drainage system. Requires early intervention to prevent severe vision loss.