A corneal ulcer can be caused by an infection of either bacterial,viral, fungal or chlamydial origin.(incidence approx 1/1000).
Symptoms can include red eye, pain, light sensitivity, reduced vision, discharge.
It is more common in contact lens wearers who have a poor contact lens care regime.
It is potentially sight threatening .Eye tests with myself are the quickest way to be referred for this type of condition. GP's mostly dont have the correct equipment to chek external eye health.
This needs to be checked the same day by an optometrist or ophthalmologist for treatment.