Introduction; Technical Description - Haag-Streit CLEMENT CLARKE OPHTHALMIC Perkins Mk3 Manuel D'instructions

1. Introduction

We would like to thank you for your decision to purchase this CLEMENT CLARKE
product.
If the instructions in this manual are carefully followed, we are confident that this
product will give you reliable and trouble-free usage.
We will be forced to disclaim any warranty and liability if the instrument is altered in
any way or if routine maintenance is neglected or not carried out according to fac-
tory specifications.
Only original CLEMENT CLARKE accessories are to be used to ensure continued
reliability of the instrument.
Following the popular Mark 2 Perkins tonometer, comes the technically advanced
and well designed Mark 3 model. Its improved LED illumination and convenience
are some of the many features which maintain the reputation of Perkins hand-held
instruments in the
forefront of tonometry.
Because the Perkins tonometer is capable of being used in all positions, the mass
of the Goldmann doubling prism must be controlled accurately. Only HAAG-
STREIT prisms should be used or the disposable Tonosafe prism can be used
to prevent cross-infection. Any other prisms may give a false reading if used in the
Perkins tonometer.

Technical Description

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A pair of spiral wound flat springs connected in series are progressively tensioned
by rotation of the operator's calibrated thumb-wheel. The resulting force stored in
the spring is
transmitted through a balanced arm to the applanation doubling prism or the
Tonosafe prism mounted at its end.
The tonometer is fitted with two cobalt blue LEDs, (wavelength 450-490nm) to pro-
vide
illumination. These are powered by a 3.6V, 280 mAh Ni-Mh rechargeable battery.
The LED meets the requirements for a Class 1 LED product to IEC/EN 60825-1
(2001) under normal operating conditions and those of single fault failure.
The battery charger conforms to Class II insulation and has also been tested to
EN60601 and UL60601-1.
This equipment is designed and manufactured to be as safe as is reasonably practicable
when installed and used correctly by persons qualified to do so in accordance with the
manufacturer's instructions. Any misuse, incorrect assembly or installation could result in
the equipment becoming unsafe. It must not be repaired except by competent
persons under the manufacturer's instructions.
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