Quiz 2

Question 1

Applying the concept of corrected curve lens theory, choose the best base curve for the following:
Applying for Ashperic Lenses:

+4.00 aspheric

Answer 1

+8.00

Question 2

Applying the concept of corrected curve lens theory, choose the best base curve for hte following:

-6.00 -2.00 x90 ASHPERIC Lenses

Answer 2

+0.50

Question 3

Transpose the following Rx:
+2.50 –0.75 x 175

Answer 3

+1.75 +0.75 x85

Question 4

Transpose the following Rx:
-3.75 +1.25 x 45

Answer 4

–2.50 –1.25 x 135

Question 5

Applying the concept of corrected curve lens theory, choose the best base curve for the following:

-1.00

Answer 5

+5.50

Question 6

Write the prescription (Rx) using the powers on the optical cross

-1.50 +4.00 x 180

+2.50 -4.00 x 90

1 and 2

neither Rx is correct

Answer 6

1 & 2

Question 7

Place the following prescription on the optical cross

+4.00 at 90 -2.00 at 180

+2.00 at 90 +4.00 at 180

+2.00 at 90 +2.00 at 180

+4.00 at 90 +2.00 at 180

Answer 7

+4.00 at 90 +2.00 at 180

Question 8

Spectacle lenses are prescribed for 4 reasons: refractive errors, faulty binocular vision, protection and comfort.

Answer 8

True

Question 9

Crown glass is clear, ophthalmic glass and has an index of refraction of 1.49

Answer 9

False

Question 10

Transpose the following Rx:
+4.00 –1.37 x 62

Answer 10

+2.62 +1.37 x152

Question 11

Write the prescription (Rx) using the powers indicated on the optical cross

• 0.12 -0.37 x180
• 0.50 -1.37 x90

+0.50 -0.37 x90

-0.12 +0.37 x180

Answer 11

-0.12 -0.37 x180

Question 12

Applying the concept of corrected curve lens theory, choose the best base curve for the following:

+6.00-2.00 x 90

Answer 12

+11.00

Question 13

Applying the concept of corrected curve lens theory, choose the best base curve for the following:

-1.00-6.00 x 90

Answer 13

+4.00

Question 14

All of the following are characteristics of minus lenses except:

Diverge Light

Virtual Focus

Thinner at center, thicker at the edges

Minify Image

Effective power Increases as the Vertex Distance Increases

Shows with motion

Answer 14

Effective power increases as the Vertex Distance Increases

Question 15

All of the following are advantages of plastic lenses except:

light weight

tints easily

scratches easily

good optics

Answer 15

scratches easily

Question 16

Put the following Rx on the optical cross. Choose the correct powers with corresponding meridian from the list below:

Answer 16

Plano at 135 -2.00 x 45

Question 17

All of the following are characteristics of plus lenses except:

Converge light

Virtual focus

Thicker at the center, thinner at the edges

Shows against motion

Effective Power Increases as the Vertex Distance Increases

Answer 17

Virtual focus

Question 18

Transpose the following Rx:
Plano –2.00 x 180

Answer 18

–2.00 +2.00 x 90

Question 19

The PRINCIPAL AXIS is an imaginary line that is perpendicular to the lens surface and where light passes through undeviated.

Answer 19

True

Question 20

CR-39 Stands for Columbia Resin’s 39th formula, and it what we refer to as plastic.

Answer 20

True

Question 21

What is the Rx from the following optical cross? Powers felt are: -3.50 at 60 plano at 150

• 3.50 -3.50 x60
• 3.50 +3.50 x60

plano -3.50 x150

1 and 2

2 and 3

Answer 21

2 & 3

Question 22

Transpose the following Rx:
+10.50 +0.75 x 25

Answer 22

+11.25 –0.75 x 115

Question 23

Applying the concept of corrected curve lens theory, choose the best base curve for the following:

+1.00 sphere

Answer 23

+7.00

Question 24

Place the following prescription on the optical cross: -1.50 –1.50 x 180

Answer 24

–3.00 at 90 -1.50 x 180

Question 25

The OPTICAL CENTER is the point on a lens through which a ray of light bends toward the base.

Answer 25

False