Acute Red Eye

Causes of an acute painful red eye include:

• Acute angle-closure glaucoma
• Anterior uveitis
• Scleritis
• Corneal abrasions or ulceration
• Keratitis
• Foreign body
• Traumatic or chemical injury

Causes of an acute painless red eye include:

• Conjunctivitis 
• Episcleritis
• Subconjunctival haemorrhage