Lecture 2 - Lens Form and Analysis

Question 1

Plano +2.00 x 090

1) What is the power in the axis meridian?
2) What is the power in the power meridian?
3) What do you think is the power 1/2 way between the two?

Answer 1

1) Plano
2) +2.00
3) +1.00

Question 2

Where will the glasses be the thickest with an Rx of -5.00 -3.00 x 090?

Answer 2

At the 180.

Question 3

A sphere focuses light as a ________ focus.

Answer 3

Point

Question 4

A cylinder focuses light as a ________ focus

Answer 4

Line

Question 5

Axis orientation increases from pt.’s ____ to _____

Answer 5

1 to 180 degrees

Question 6

Maximum cylinder power is always ____ degrees away from the axis meridian

Answer 6

90

Question 7

Plus lenses will exhibit ______ motion if the object distance is within the lenses’ ______.

Answer 7

Against. Focal Length

Question 8

Minus lenses will exhibit _____ motion.

Answer 8

With.

Question 9

Where is the cylinder power located in minus cylinder?

Answer 9

F2 lens surface

Question 10

Where is the base curve ALWAYS located?

Answer 10

Front

Question 11

Where is the segment and cylinder located in a plus lens?

Answer 11

Segment - F2

Cylinder - F1

Question 12

F1@090= +2.00 F1@180=+6.00
F2= -2.00 Ft= ???
What is the final Rx.?

Answer 12

+4.00 - 4.00 x 180

Question 13

F2@090 = -4.00 F2@180 = -6.00

F1=? Ft= +3.00 -2.00 x090

Answer 13

+7.00

Question 14

What form (+ or - cyl) should the following lenses be written in and what is Ft?

F1= +6.00, F2@ 090 =-8.00 and F2@ 180 = -6.00

Answer 14

Minus and Pl. -2.00 x180

Question 15

You are filling an putsode Rx written in plus cylinder form.
Transpose.
OD +2.00 +1.00 x045 OS +3.00 +1.50 x160

Answer 15

OD +3.00 -1.00 x135

OS +4.50 -1.50 x070