Deck 6: Lensometry and Spectacle Skills

Question 1

A patient's spectacle correction should be measured and recorded when?

A)At their first visit
B)Every visit
C)After a new prescription has been filled
D)A and C

Answer 1

A and C

Question 2

During a lensometer examination, if the examiner is severely astigmatic, they should

A)wear their glasses.
B)adjust the instrument's reticle.
C)center the mires.
D)stay away from the lensometer.

Answer 2

wear their glasses.

Question 3

A plus lens is produced by

A)putting two prisms apex to apex.
B)putting two prisms base to base.
C)putting two prisms base to apex.
D)none of the above.

Answer 3

putting two prisms base to base.

Question 4

The amount of induced prism and the direction of the prism are determined by

A)the position of the eyes.
B)the prescription.
C)the position of the nose.
D)A and B.

Question 5

Which is a handheld instrument that measures the surface power of a spectacle lens in diopters?

A)Keratometer
B)Lensometer
C)Geneva Lens Clock
D)Tonometer

Question 6

Which of the following is a unit of measurement for the optical power of a lens?

A)Cylinder (cyl)
B)Sphere (sph)
C)Diopter
D)Axis

Question 7

Convex lenses have what type of dioptric value?

A)Positive
B)Negative
C)Neutral
D)None of the above

Question 8

What does it mean when the mires cannot be centered in the lensometer?

A)The stage must be move up
B)The stage must be moved down
C)The lens prism has been ground into the lens
D)The power dial needs to be rotated

Question 9

Heat tempering glass lenses is done in order to

A)prevent impact breakage.
B)resist tension.
C)increase thickness of glass.
D)polarize light.

Question 10

Unintentional induced prism can cause which of the following?

A)Weak lenses
B)Eye strain
C)Conjunctivitis
D)Myopia

Question 11

A patient suffering from a strabismus or a crossed eye may be prescribed which of the following?

A)Convex lenses
B)Concave lenses
C)Prism lenses
D)Reading glasses

Question 12

What would be the spherical equivalent of a (-2.00 + 2.00x90) lens?

A)-3.00
B)-1.00
C)+1.00
D)-2.00

Question 13

If a patient has diplopia in both eyes, it may be corrected with what type of lens?

A)Plus lens
B)Minus lens
C)Prism lens
D)A spherocylinder in each lens

Question 14

How might transposition of an eyeglass prescription be used?

A)To find the refractive index
B)To find the focal length of a lens
C)To determine a patient's refraction
D)To convert a minus cylinder power to a plus cylinder power

Question 15

What type of lenses reduce glare?

A)Polarized lenses
B)Scratch-resistant lenses
C)Photochromic lenses
D)UV-protection lenses

Question 16

Transpose the following spherocylindrical minus prescription: +2.00 -1.00 x 180

A)+1.00 -2.00 x 90
B)+2.00 -3.00 x 180
C)+1.00 +1.00 x 90
D)-1.00 - 2.00 x 90

Question 17

In the following lens prescription, which number represents the spherical power: +1.00 +0.50 x 70

A)1)00
B)0)50
C)70
D)The spherical power is not part of the lens prescription

Question 18

What is the spherical equivalent of the following prescription: +2.00 +2.00 x 60

A)+2.00
B)-2.00
C)+3.00
D)-2.50

Question 19

What is used to measure the vertex distance of a pair of eyeglasses?

A)Caliper
B)Geneva lens gauge
C)A small millimeter ruler
D)An index card

Question 20

What is the recommended height of a bifocal segment?

A)6 mm above the lower lid margin
B)At the lower lid margin
C)4 mm above the lower lid margin
D)4 mm below the lower lid margin

Question 21

The vertical angle that the frame front makes to the face when glasses are worn is known as

A)vertex distance.
B)brow tilt.
C)base curve.
D)pantoscopic angle.

Question 22

What type of lenses darken when outdoors and lighten when indoors?

A)Polarized lenses
B)Photochromic lenses
C)Tinted lenses
D)Antireflective lenses

Question 23

A lens made up of sphere power and cylinder power is known as a

A)spherocylindrical lens.
B)cylindrospherical lens.
C)cross cylinder.
D)progressive lens.

Question 24

The majority of glasses dispensed are made out of what material?

A)Glass
B)Plastic
C)Polycarbonate
D)Vinyl