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Perkins Tonometer

Toronto Rehabilitation Institute

A black box with a rectangular footprint has two latches on the front surface to secure the lid. The interior of the case is lined with foam which has a blue fabric cover. Recesses in this liner cradle the following objects:

One white and black instrument. The black element at the bottom of the instrument is a battery holder. The optical element, including attachment points for a viewing aperture and a prism, is located towards the other end.

One black, cone-like viewing aperture.

One extra 2.8v bulb.

One white forehead rest.

One two-gram and one five-gram weights.

One smaller black prism.

One black setting block.

Four AA batteries.

One instruction manual booklet and one separate instructional document.

Accession Number:

Alternative Name:

Perkins Tonometer MK2; Hand-Held Applanation Tonometer.

Primary Materials: Plastic, Metal.


An embossed tag on one side of the instrument reads “Toronto Rehabilitation Institute// Asset # 27037”
A second tag with a printed bar code reads “TRI27037”

Printed on the side instrument is the following serial number “SN1999T2728”

Dimensions (cm):

Case: Height = 7.2, Width = 13, Length = 32.


A tonometer is an instrument for measuring intraocular pressure (IOP). This is typically done to diagnose glaucoma, a disease that can damage the optic nerve.

The Perkins tonometer is a handheld instrument that uses an optical system to measure the pressure within the eye.


Excellent: This instrument has very few visible signs of wear.

Associated Instruments:


Clement Clarke International Ltd. Harlow, Essex, UK

Date of Manufacture: c. 1999


This artifact among a collection of items acquired from the Toronto Rehabilitation Institute on December 6th, 2017.

Additional Information and References:

Historical Notes:


  • Donated to UTSIC