Z-type applanation tonometer exclusively for use with 2ZL/4ZL Based on Goldmann applanation tonometry and designed for use with TAKAGI slit lamps, the AT-2 (Z-type) provide rapid, safe, and accurate intraocular pressure (IOP) measurement required for the diagnosis of such conditions as glaucoma, ocular hypertension, and retinal detachment. AT-2 conform to international standard ISO 8612:2009, which sets out requirements concerning accuracy and reliability of the measurements of applanation tonometers.