American Optical 12415 NON-CONTACT II TONOMETER EYE EXAM OPTOMETRY

Description

Non-contact tonometer
The non-contact
tonometer
applanates the cornea by a jet of air, so there is no direct contact between the device and the surface of the eye. This theoretically avoids the need to sterilize the instrument, but a recent study found the air puff produces a tear film aerosol that could potentially contain infectious material.
The force of the air jet increases rapidly and linearly with time. The instrument also emits a collimated beam of light that is reflected from the central cornea and then received by a photocell. When an area of the cornea 3.6 mm in diameter is flattened, the light reflected to the photocell is at a maximum. The time required to produce the peak reflection is directly related to the force of the air jet and thus to the counterbalancing IOP.
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