Ch8. Tear Film Examination Flashcards
1
Q
% of normal population that will have an absent bell’s phenomenon?
A
5%
2
Q
Normal TBUT?
A
10-30 sec
3
Q
What is the ocular protección index OPI?
A
The ratio of the TBUT over the interblink interval.
Values below 1 are abnormal.
4
Q
What is the normal value for non-anesthesia Schormer’s test?
A
More than 5.5 mm after 5 min
5
Q
What is the tear Ferning grading?
A
When tears are dried on a slide and examined under microscope the mucin displays a pattern than resembles ferns. This can be graded, and has been reported to be more sensitive and specific for DRy eye disease.
