General Information

Serial #

8202

Part Number

1

Total Parts

6

AKA

N/A

Patents

N/A

General Description

metal

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

13.0 cm

Width

4.4 cm

Height

1.1 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Medical Technology

Category

Instruments

Sub-Category

N/A

Manufacturer

AKA

Hako

Country

Unknown

State/Province

Unknown

City

Unknown

Context

Country

Canada

State/Province

Quebec

Period

Presumably used after c. 1948.

Canada

Used by late Dr. A. Isserman, in Montreal PQ.

Function

Used to measure the intraocular pressure.

Technical

Indentation tonometer measures the amount of corneal indentation that occurs when a given weight is placed on the cornea. The result is inversely proportional to the intraocular pressure, and must be obtained from a table of values (missing). Schiotz tonometer is typically supplied with 5.5g weight (permanently fitted to instrument), 7.5 g weight (missing) and 10g weight, and value table. Elevated intraocular pressure is a symptom of various medical disorders, including glaucoma. Designed by Hjalmar August Schiotz, and first demonstrated in 1905, the Schiotz tonometer was quickly adopted and used worldwide. Though still used in both human and veterinary practices (2005), it has largely been replaced by less invasive instruments, which do not employ direct contact with the cornea. (ref. 2)

Area Notes

Unknown

Details

Markings

Scale divided 0 to 20, in single increments. "[logo]/ HAKO/ 2020" marked on left front of scale. "5.5" stamped into weight, and back of indicator needle.

Missing

Tonometer is complete; however, instrument set missing 1 weight (7.5 g).

Finish

Brushed and bright silver metal finishes; scale background is black.

Decoration

N/A