OPT-1156 Ophthalmic Lens II Unit 3

Question 1

In Dissimilar Segs and Compensated R Segs, the seg with the optical center closest to the top of the seg center is place in lens with the most plus power.

Answer 1

False

Question 2

In coma, the pupil of the wearer has no effect on the aberration.

Answer 2

False

Question 3

The pupil of the wearer reduces the effect of spherical aberration.

Answer 3

True

Question 4

What is the following abberation ?

Answer 4

Spherical aberration

Question 5

In coma, the aberration is a result of rays of light parallel to the lens surface.

Answer 5

False

Question 6

specular images, and the path of the light ray, find the percent of intensity.

Answer 6

3.94%

Question 7

that kind of Chromatic aberration is this ?

Answer 7

Distortion: minus lens

Question 8

Reverse slab off is available in half diopter steps.

Answer 8

True

Question 9

What is the this Chromatic Abberation ?

Answer 9

Curvature of Field

Question 10

The refracting power of a lens decreases toward the periphery.

Answer 10

False

Question 11

What is the intensity of this specular reflection?

Answer 11

4.3%

Question 12

Spherical aberration results from the lens having different powers in different areas of the lens.

Answer 12

True

Question 13

In distortion, the object will appear to have a pincushion look when viewed through a minus lens.

Answer 13

False

Question 14

Chromatic aberration a result of the nature of the material from which lens is made.

Answer 14

True

Question 15

The higher the index of refraction of the lens, the greater amount of specular reflection will occur.

Answer 15

True

Question 16

An aspheric front surface of a plus lens steepens toward the periphery.

Answer 16

False

Question 17

AR coatings help eliminate specular reflections.

Answer 17

True

Question 18

n curvature of field, the image is curved.

Answer 18

True

Question 19

What is the this chromatic abberation

Answer 19

Distortion: plus lens

Question 20

For the Following RX:

OD -4.00 -2.00 X 45 add +2.00 OU
OS -4.50 -4.00 X 180 RL 8mm

Determine Conventional Slab off:

Answer 20

2.8 BU OS

Question 21

Conventional slab off is available in quarter diopter steps.

Answer 21

True

Question 22

In coma, the aberration is a result of rays of light oblique to the lens surface

Answer 22

True