Description
With the Perkins tonometer, the pressure is read directly from a scale calibrated in mm. Hg.
The instrument can be operated from the mains electricity supply using a transformer or, alternatively, from a standard 6-volt power pack. It is held in precisely the same manner as an ophthalmoscope. The force of the prism is adjusted to 1 g. as in the Goldmann instrument, and after the forehead rest is applied the instrument is simply rotated until the prism makes contact with the
centre of the cornea.
The fluorescein “rings” are viewed through a +20 D lens and the pressure is
adjusted via a knurled wheel acting on a spring. Perkins Tonometer comes with a fully rechargeable battery and can be added to your string of accurate instruments.
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