Lecture 2 - Lens Form and Analysis Flashcards Preview

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Flashcards in Lecture 2 - Lens Form and Analysis Deck (15)
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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?

1) Plano
2) +2.00
3) +1.00

2

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

At the 180.

3

A sphere focuses light as a ________ focus.

Point

4

A cylinder focuses light as a ________ focus

Line

5

Axis orientation increases from pt.'s ____ to _____

1 to 180 degrees

6

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

90

7

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

Against. Focal Length

8

Minus lenses will exhibit _____ motion.

With.

9

Where is the cylinder power located in minus cylinder?

F2 lens surface

10

Where is the base curve ALWAYS located?

Front

11

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

Segment - F2
Cylinder - F1

12

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

+4.00 - 4.00 x 180

13

F2@090 = -4.00 F2@180 = -6.00
F1=? Ft= +3.00 -2.00 x090

+7.00

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

Minus and Pl. -2.00 x180

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

OD +3.00 -1.00 x135
OS +4.50 -1.50 x070