Keeler D-KAT Z, Instructions For Use Manual

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4
EN
D-KAT Z-Type Tonometer by KEELER
1. INDICATIONS FOR USE
These devices are intended to be used only by suitably trained and authorised healthcare
professionals.
CAUTION: Federal Law restricts this device to sale by or on the order of a
physician or practitioner.
1.1 BRIEF DESCRIPTION OF THE INSTRUMENT
The Keeler Applanation Tonometer operates according to the “Goldmann method”, by
measuring intraocular pressure from the force required to flatten (applanate) a constant
area (3.06 mm) of the cornea. A special disinfected (or single use) prism is mounted on the
Tonometer head and then placed against the cornea.
The examiner, using a slit lamp biomicroscope at 10x magnification, with a blue filter views
two fluorescing green semicircles. The force applied to the Tonometer head is then adjusted
using the dial until the inner edges of these green semicircles meet.
Because physical contact with the cornea takes place, it is necessary to apply to the patient’s
cornea a suitable topical anaesthetic.
1.2 INTENDED USE / PURPOSE OF INSTRUMENT
The Keeler Digital Applanation Tonometer is indicated for measuring intraocular pressure to aid
in the screening and diagnosis of glaucoma.
The Digital Keeler Applanation Tonometer (D-KAT Z-type) is intended to determine the
intraocular pressure (IOP) by exerting an external force against the eye which provides reading
of the resistance of tunica of the eye of deformation.
The Keeler Digital Applanation Tonometer (D-KAT) is an accessory item for most ‘Zeiss
illumination’ type of Slit Lamps and thanks to its versatility, the D-KAT Tonometer can be
mounted on and used with slit lamps produced by many manufacturers.
1.3 HOW THE INTRAOCULAR PRESSURE (IOP) IS MEASURED
The cornea is flattened by an acrylic measuring prism
on a ring support at the end of the Tonometer sensor
arm assembly. It is flat with smooth or rounded
margins to avoid any damage to the cornea.
The measuring prism is brought into contact with
the patient’s eye by moving the slit lamp forward.
The measurement drum is then turned to increase
the pressure on the eye, until a continuous, uniform
applanated surface 3.06 mm in diameter (7,354 mm²
area) is obtained. The doubling prism divides the
image and presents the two opposing semicircular
halves at 3.06 mm (see section 13 on page 22
Measurement procedure for further details).
LED Display
mmHg Force
mN Pressure
kPa
10 9.81 1.33
20 19.62 2.66
30 29.43 3.99
40 39.24 5.32
50 49.05 6.65
60 58.86 7.98
Relationship between the LED display
and the force and pressure on the
applanated surface.