Primary Open Angle Glaucoma (POAG): Progresses slowly with gradual loss of vision. Patient is often unaware as the straight ahead vision and reading vision might remain unaffected initially. Some patients have POAG but have normal eye pressure this is called as Normal Tension Glaucoma. This type of glaucoma responds well to treatment with anti-glaucoma eye drops. If they fail, surgery to reduce eye pressure may be necessary.
Angle Closure Glaucoma(ACG): An acute angle closure attack of the eye may present with decreased vision, haloes around lights, eyeache, headache, nausea and/or vomiting. The initial intraocular pressure is reduced by medical treatment, laser treatment(Peripheral Iridotomy/PI) is done. If these fail then surgery is necessary. A laser treatment in the fellow eye is done to prevent the chance of similar attack.
Congenital Glaucoma: This type of glaucoma is rare and occurs at birth or soon after. Enlargement of the eyes, watering, unusual sensitivity to light or haziness. Surgical treatment is the only intervention and should be done as early as possible.
Secondary Glaucoma: The pressure of the eye rises because of conditions in the eye like eye surgery, injuries, inflammation, advance cataracts, tumours etc.