Which class of drugs is used to inhibit corneal sensation?

Anaesthetics are used to inhibit corneal sensation because they block the transmission of nerve impulses in the cornea, providing temporary loss of feeling in the area. This property is particularly useful in ophthalmic procedures, allowing for various diagnostic and therapeutic interventions without causing discomfort to the patient. By numbing the cornea, anaesthetics facilitate procedures like tonometry or foreign body removal, making them essential in ophthalmic practice.

The other classes of drugs listed do not serve this purpose. Antibiotics are primarily used to treat or prevent infections, not to alter sensation. Vasodilators work by widening blood vessels, which does not affect nerve sensation in the cornea. Antihistamines are used to alleviate allergic reactions and symptoms such as itching and inflammation, rather than to inhibit sensory function in the cornea. Therefore, anaesthetics are the correct choice for inhibiting corneal sensation.