Are there different types of Glaucoma?
The most common is chronic glaucoma (chronic = slow) in which eye pressure rises very slowly and there is no pain to show there is a problem, but the field of vision gradually becomes impaired.
The early loss in the field of vision is usually in the shape of an arc a little above and/or below the centre when looking ‘straight ahead’. This blank area, if the glaucoma is untreated, spreads both outwards and inwards. The centre of the field is last affected so that eventually it becomes like looking through a long tube, so called ‘tunnel vision’. In time even the sight would be lost.
Acute glaucoma (acute = sudden) is much less common in western countries. This happens when there is a sudden rise in eye pressure. This can be quite painful and will cause permanent damage to your sight if not treated promptly.
The sudden increase in eye pressure can be very painful. The affected eye becomes red,the sight deteriorates and may even black out. There may also be nausea and vomiting. In the early stages you may see misty rainbow coloured rings around white lights. Sometimes people have a serious of mild attacks, often in the evening. Vision may seem ‘misty’ with coloured rings seen around white lights and there may be some discomfort in the eye.