Inaccurate Pressure - Perkins Mk2 Manuel D'instructions

9.

Inaccurate Pressure

4
Result
The outer edges of
the fluorescein rings
touch each other
The fluorescein rings
coincide and form a
line
The fluorescein rings
do not touch each
other
Correct position:
The inner edges of
the fluorescein rings
touch each other
Fig 13
27
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Image in ocular Cause
Pressure is too strongly
reduced
The pressure is reduced
The pressure is too
strongly increased
Accurate pressure -
precise focusing of the
measuring prism
Correction
Increase the pressure by
turning the milled thumb
wheel.
Increase the pressure by
turning the milled thumb
wheel.
Reduce the pressure by
turning the milled thumb
wheel.