In ophthalmology in order to numb the surface of the eye (the outermost layers of the cornea and conjunctiva) for the following purposes:[1] in order to perform a contact/applanation tonometry, for small operations, in order to remove small foreign objects from the uppermost layer of the cornea or conjunctiva; in otolaryngology for numbing the mucous membranes of the nostrils and pharynx, for diagnostic purposes and small operations,[2] for numbing the mucous membranes of bronchi, for example in bronchoscopy,[2] and the oesophagus, for example in intubation.[2]