The eye may become very painful and due to the intensity of the pressure, nausea and vomiting may occur. It is possible to feel quite unwell.

• The eye may be red.
• The vision in the eye may decrease.
• The clear window at the front of the eye may become cloudy.
• The pupil (the black part of the eye) may be semi-dilated and fixed.
• Are there any Signs & Symptoms prior to a full-blown acute attack?

Yes, there can be. Acute Glaucoma attacks are not always full blown and can occur without any trigger event, but commonly occur in the evening because the pupil dilates in dim light. Seeing halos at night may precede an attack.