Inaccurate Vertical Centering - Haag-Streit CLEMENT CLARKE OPHTHALMIC Perkins Mk3 Manuel D'instructions

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Inaccurate Vertical Centering

9.
3
Result
A semi circular ring
appears partly in the
upper half
The ring appears
completely in the
upper half
The ring appears
almost completely in
the upper half, and
partly cut in the lower
half
Two partly cut rings
appear, the larger
one in the upper half
Correct position: The
edges of both semi
circular rings meet
exactly in the centre
of the ocular
Fig 12
27
Image in ocular
The measuring prism is not
focused on the eye. The
eye is too far up.
The measuring prism is not
focused on the eye. The
eye is still too far up.
The measuring prism is not
focused on the eye. The
eye is still too far up.
The measuring prism is not
focused on the eye.
The eye is still too far up.
The measuring prism is
focused precisely on the
eye.
Cause Correction
Move the tonometer
upwards.
Move the tonometer
upwards.
Move the tonometer
upwards.
Move the tonometer
upwards.