To Prepare The Prism For Use; Remove Perkins Mk2 Tonometer From Case; Doubling Prism; To Insert Prism Into Prism Holder - Perkins Mk2 Manuel D'instructions

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To Prepare the Prism for Use

Remove the Perkins tonometer from the carrying case by holding the main body. Under no

circumstances should it be lifted by the prism holder (4 Fig 1).

The doubling prism should be prepared for use by cleaning following the cleaning instructions

supplied with the prisms.

To insert the prism into the prism holder (4 Fig 1) gently press prism cone downward into the

prism holder (A Fig 4) and push into position along horizontal axis (B Fig 4).

N.B. Failure to follow these instructions could result in severe damage being

caused to the instrument.

Alternatively, Tonosafe disposable prisms may be used. These are supplied as sterile single

use items to help eliminate the risk of cross infection.

Tonosafe and the prism holder have the same mass as the original doubling prism, so no

conversion of results is required. The disposable prism can be inserted in the same manner

as above.

The battery handle will accept four standard size AA batteries. To fit them in the instrument

proceed as follows:-

Press the two battery handle securing buttons (10 Fig 2) simultaneously and withdraw the

battery case (11 Fig 2), which forms the handle portion of the tonometer. Place the batteries

into the battery handle (11 Fig 2) ensuring they are positioned as indicated by the symbols on

the base (Fig 5a, p16).

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Fig 4

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