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9. Problem solving
9.4 The inside margins of the fluorescein rings are not aligned and touching
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Cause:
Excessive pressure has been applied.
Correction:
Reduce pressure until the semicircular
images come closer together and finally the
inner margins align with each other, as
shown in the last illustration.
Correct final position
The inner margins of the fluorescein
semicircular images are aligned and just
touching each other.
Cause:
The semicircular images are well centred.
The outer margins are aligned but the inner
margins are not.
Correction:
Increase pressure by rotating the
measurement drum.
Cause:
In this case, the inner margins of one
semicircle are aligned with the outer margins
of the other.
Correction:
Increase pressure by rotating the
measurement drum.
