Tonometry is a method of measuring the pressure of the eye. This is done by measuring the “tone” or firmness of its surface.

The main reason for this test is to pick up any early signs of glaucoma in a patient. The earlier any evidence of glaucoma is found the better and more successful the treatment. Glaucoma, if left untreated, can cause blindness.

No more fondly remembered ‘puff of air’ test.

Richard Petrie Optometrists now use the “iCare tonometer”. A small disposable probe touches the cornea very lightly for a fraction of a second. The measurement is barely noticeable by the patient and therefore suitable even for sensitive patients – the vast majority of patients never feel it at all.  The higher the pressure of the eye, the quicker the bounceback of the probe.

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