Lesson 11

Question 1

What kind of lens has a single point focus

Answer 1

Spherical lens

Question 2

Spherical lens are used to

Answer 2

Correct myopia and hyperopia

Question 3

The eye cannot bring light to a single point focus on the retina when

Answer 3

The retracting surface of the eye is not spherical

Question 4

A cylinder lens is utilized to correct

Answer 4

Astigmatism

Question 5

What has no refracting power in the lens

Answer 5

The axis meridian

Question 6

What’s the power meridian

Answer 6

The meridian of the cylinder lens that has one flat surface and one curved surface

Question 7

When quantifying a cylinder lens, what must be specified

Answer 7

Dioptic power and the orientation of the lens

Question 8

What is the nominal power

Answer 8

The sum of the lens front and back surface power

Question 9

What’s the Toric

Answer 9

Surface which consists of seperate curves on a surface

Question 10

What are the steps of toric transposition

Answer 10

1. Add the sphere and cylinder vvalues to obtain new sphere
   value
2. Change sign of cylinder
3. Change axis by 90

Question 11

What are the four parts of a prescription

Answer 11

1. Sphere power
2. Cylinder power
3. Axis of cylinder
4. Add power

Question 12

What does DS mean

Answer 12

Diopter sphere; no cylinder component is needed in glasses

Question 13

What signifies the power of a bifocal

Answer 13

The add power

Question 14

Persay someone’s vision is 20/20. What does the second 20 refer to

Answer 14

The smallest size letter the patient is able to read at 20ft

Question 15

What is the minutes of arc

Answer 15

Angular measurement of size of letter arc

Question 16

The larger the second number in a vision, the

Answer 16

Larger the letter needs to be in order for the patient to read it