OPT-2501 Cntct Lns Theory I Unit 5

Question 1

WHICH OF THE FOLLOWING LID POSITIONS IS PREFERED WHEN FITTING RGP LENSES?

Answer 1

U = +2 L = 0

Question 2

A HYPERFLANGE LENS DESIGN IS MOST FREQUENTLY INDICATED FOR WHICH OF THE FOLLOWING?

Answer 2

A HIGH MINUS

Question 3

IF A PATIENT’S PRESCRIPTION IS: -2.50 +0.25 X 90 AND THE LENS IS TO BE FITTED 0.75 DIOPTERS STEEPER THAN THE FLATTEST MERIDIAN OF THE CORNEA, THE POWER OF THE CONTACT LENS SHOULD BE:

Answer 3

-3.00

Question 4

“K” READINGS : 43.00/44.25 @ 90
Rx: -4.00 +1.25 x 90
USING THE DATA ABOVE, THE CORRECT DESIGN OF THE CENTRAL POSTERIOR CURVE (BASE CURVE) AND POWER OF A CONTACT LENS FITTED ON “K” WOULD BE:

Answer 4

43.00 -2.75

Question 5

SAGITTAL VALUE DESCRIBES:

Answer 5

THE VAULTING EFFECT OF A LENS

Question 6

WITH A RIGID CONTACT LENS IN PLACE, A FLUORESCEIN PATTERN SHOWS A NARROW BAND HORIZONTALLY WITH A CONCENTRATION OF FLUORESCEIN INFERIORLY AND SUPERIORLY UNDER THE LENS. WHICH ONE OF THE FOLLOWING TYPES OF ASTIGMATISM IS REPRESENTED BY THIS PATTERN?

Answer 6

WITH THE RULE

Question 7

________IS USED TO THIN THE EDGE OF A HIGH MINUS CONTACT LENS.

Answer 7

HYPERFLANGE

Question 8

WHEN OBSERVING A FLUORESCEIN PATTERN, AN OVAL TOUCH IN THE VERTICAL MERIDIAN WOULD INDICATE:

Answer 8

A FLAT FIT AND AGAINST THE RULE ASTIGMATISM