Which drug is used for applanation tonometry?

Applanation tonometry is a technique used to measure intraocular pressure, a crucial aspect of diagnosing glaucoma and other eye conditions. A key component of this procedure is the use of a topical anesthetic to minimize discomfort for the patient, as the procedure involves contact with the eye.

Proparacaine is an effective topical anesthetic that is commonly used in this context. It works by blocking nerve signals in the area where it is applied, thereby numbing the surface of the eye. This allows for a pain-free experience during the tonometry process, enabling accurate measurement of intraocular pressure without causing distress to the patient.

Other substances listed do not serve the same purpose in the context of applanation tonometry. For instance, hydrogen peroxide is an antiseptic and not an anesthetic. Atropine is used primarily for its dilating properties in the eye, but does not provide anesthesia. Pilocarpine is a medication that constricts the pupils and is mainly used in treating glaucoma, not as an anesthetic for procedures. Thus, the use of proparacaine is specifically suited for ensuring comfort during applanation tonometry.