The device uses an induction coil to magnetise the probe and fire it against the cornea .
Rebound tonometers determine intraocular pressure by bouncing a small plastic tipped metal probe against the cornea .
The device uses an induction coil to magnetise the probe and fire probe against the cornea .
Rebound tonometers determine intraocular pressure by bouncing a small plastic tipped metal probe against the cornea .