Tonometers are manual devices intended to measure intraocular pressure by applying a known force on the globe of the eye and measuring the amount of indentation produced (Schiotz type) or to measure intraocular tension by applanation (applying a small flat disk to the cornea) and are sold under the Millennium Surgical, Symmetry Surgical, Accutome, Boss Instruments, and Medline Industries brand names.

The reason these devices are being withdrawn from the market by Instrumed is that Instrumed did not market these devices prior to September 26, 1976, and therefore, does not meet all FDA requirements to market the devices as "Pre-Amendment" devices.

Instrumed sent an URGENT: MEDICAL DEVICE MARKET WITHDRAWAL letters dated October 9, 2014 to all affected customers. The letter included instructions for customers to: 1) examine their inventory to determine if there are any recalled devices; 2) complete and return the enclosed Confirmation Request Form; 3) return the recalled devices; and 4) share the recall information with facility staff. Customers with questions were instructed to contact Instrumed by telephone at 847-908-6119.