Measuring Prism Replacement - Haag-Streit Perkins Mk2 Manual De Instrucciones

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3. Safety and Regulatory Information
3. Safety Notices
1
Before each use the contact surface of all prisms should be checked for
contamination or damage (such as scratching, rips or sharp edges).
A slit lamp microscope or Loupe is best used for this purpose, at a magnification
of 10x to 16x.
• If cracks form, the disinfectant may get into the hollow interior and can enter the
patient's eye while tonometry is taking place, leading to irritation of the cornea.
Defective measuring prisms should not be used, to avoid any damage to the
patient's cornea.

Measuring Prism Replacement

3.
2
• Due to the number of variables involved - type and concentration of disinfecting
material used, number of patients, handling etc. - it is almost impossible to put a
figure on the number of times and/or period of time that a measuring prism can
safely be used for.
• Our experience, and that of our users, indicates that under 'normal' usage (i.e. as
per the instructions contained within this instruction manual) a maximum of two
years provides an adequate safety factor.
• HAAG-STREIT therefore recommend strongly that no measuring prism is used
beyond two years from it's date of first usage (a measuring prism may be retained
as a spare indefinitely - deterioration does not start until it is first used).
• The recommended time is overruled if the prism is in any way damaged within
this time period -
7
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No damaged prisms should be used
damaged prisms should be immediately discarded.
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