When suspecting contact allergy in the periorbital area, patch testing should be considered in order to identify and avoid offending allergens. Testing to substances from a standardised ophthalmic tray is recommended, but it is preferable to test the actual drops or creams since many chemicals that are present in ophthalmics are not available as commercial test allergens. Given their wide use, preservatives cannot be regarded as common allergens, while antibiotics cause more often true allergic reactions necessitating a long-term avoidance.