To Use The Instrument On Animals; Special Precautions - Clement Clarke Perkins Mark 3 Manual De Instrucciones

Astigmatism
8.
1
For example
If the corneal astigmatism amounts to
6.5 mm/ 30˚ = 52.0 D/30˚ and
8.5 mm/120˚ = 40.0 D/120˚
the graduation value 120˚ of the prism is set at the 43˚ mark of the prism holder.
If there is a corneal astigmatism of
8.5mm/30˚ = 40.0D/30˚ and
6.5mm/120˚ = 52.0D/120˚
the graduation value 30˚ is set at the 43˚ mark.
In other words, set the axial position of the greatest radius, that is the axis of a minus
cylinder, on the prism graduation at the red mark on the prism holder.

To use the instrument on animals

8.
2
nea and the Fick-Maklakov law does not apply for the standard diameter of applanation. It is
necessary to remove the patient's forehead rest and calibrate the tonometer for each species
used. This can be done quite simply by connecting the anterior chamber to a
found that the tonometric reading is lower than that obtained for the human eye. The eyes
of rhesus and cynomolgus monkeys behave very similarly to the human eye, but those of the
rabbit and cat give lower readings
Note: If the instrument is used on animals then this device falls outside of the CE1639
approval as a medical device.

Special Precautions

8.
3
The Perkins hand-held tonometer is a delicate precision instrument, carefully inspected
accompanying each tonometer. It is desirable to clean the calibrating weights, as well as
the prism, in an antiseptic solution, before checking the instrument, to minimize the risks
of cross-infection (see cleaning instructions accompanying the prisms for decontamination
instructions).
- continued
at 0 - 5 gram positions on the scale
en
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