OPT-2501 Cntct Lns Theory I Unit 2 Flashcards
Correct
THE TOPOGRAPHER_______________________________________.
PROVIDES A COMPUTER GENERATED MAP OF CORNEAL
CURATURE.
THE KERATOMETER IS DESIGNED TO MEASURE THE CORNEA AT
THE _________.
VISUAL CENTER
GIVEN THE FOLLOWING INFORMATION CALCULATE THE RESIDUAL
ASTIGMATISM (CRA) IF THE PATIENT IS FIT WITH A RIGID C.L.:
Rx: +6.00 +0.25 x 80
Ks: 42.25 / 43.75 @ 80
1.25D
THE FOLLOWING KERATOMETER READINGS INDICATE WHAT TYPE OF
ASTIGMATISM? 45.00@20 / 46.00@110
WITH THE RULE
GIVEN THE FOLLOWING INFORMATION CALCULATE THE RESIDUAL
ASTIGMATISM (CRA) IF THE PATIENT IS FIT WITH A RIGID C.L.:
Rx: -2.00 -1.50 x 180
Ks: 41.50 / 43.25 @ 90
0.25D
THE AREA OF THE CORNEA WITH THE STEEPEST CURVATURE IS
THE __________.
APEX
BEFORE USING ANY KERATOMETER IT IS NECESSARY TO:
FOCUS THE EYEPIECE
IF A PATIENT’S “K” READINGS ARE 46.00@180 / 43.75@90
THE MEASURABLE CORNEAL ASTIGMATISM IS _______ DIOPTERS.
2.25
THE FOLLOWING KERATOMETER READINGS INDICATE WHAT TYPE
OF ASTIGMATISM? 43.00@145 / 41.00@55
OBLIQUE
A ________ LENS MAY BE USED TO EXTEND THE RANGE OF THE
KERATOMETER FROM 52.00 TO 61.00 DIOPTERS.
+1.25
