Week 3 Quiz review

Question 1

If we are given a HVID what diameter do we use?

Answer 1

+2mm onto that size

Question 2

If we are not given a HVID what diameter do we use?

Answer 2

14mm

Question 3

What type of manufacturing method of soft contact lenses starts out as a button?

Answer 3

Lathe Cut

Question 3

The patient is advised the contact lens is only good for 30 days as it is a monthly design. What is this called?

Answer 3

Modality

Question 4

When observing through the slit lamp the fit appears good, but upon push up test the lens moves slowly or very little. What would you do to the base curve of this lens to improve the fit?

Answer 4

Flatten the base curve

Question 5

Slit lamp illumination used to see the whole eye including the contact lens.

Answer 5

Diffuse

Question 6

A toric lens with 2 radii on the posterior surface of the lens is considered to be what toric design?

Answer 6

Back side Toric

Question 7

The modulus of a silicone hydrogel is more rigid than the hydrogel lenses. T/F

Answer 7

True - hydrogels can be very difficult to handle due to the modulus being floppy/flimbsy

Question 8

Name the most common manufacuring process of soft contact lenses today.

Answer 8

Cast molding (injection molding)

Question 9

Silicone Hydrogel lenses are the number one soft lens material of choice. T/F

Answer 9

TRUE

Question 10

Name the modality for lenses that are worn only during the daytime, not worn at night and have a strict cleaning regime.

Answer 10

Daily Wear (DW)

Question 11

What do the markings on the toric lens represent?

Answer 11

They indicate how the toric lens should be sitting in place on the eye for proper visual acuity.

Question 12

A low water content lens should be used for High RX’s. T/F

Answer 12

FALSE

Question 13

A keratometer is used to assess wettability of the contact lens. T/F

Answer 13

TRUE

Question 14

What are 2 things that can be done to improve a loose fitting CL?

Answer 14

Keep the BC the same and select a larger diameter
Steepen the BC keep the diameter the same.

Question 15

What are the 4 checks when checking for CLs movement?

Answer 15

the push up test
upward gaze
lateral gaze
blinking

Question 16

The HVID of the patient is 13mm, what diameter should you order?

Answer 16

15mm

Question 17

Your patient complains about lens dehydration, what hydrogel lens type would you recommend?

Answer 17

Low water content

Question 18

What equipment is used to assess tear prism?

Answer 18

K5M or ruler with slit lamp

Question 19

A radiuscope is used to assess the back power of a contact lens. T/F

Answer 19

FALSE: Lensmeter

Question 20

Wearing Extended Wear (EW) contact lenses for 7 nights in a row is being compliant with this type of modality. T/F

Answer 20

FALSE - 6 nights would be within compliance

Question 21

What equipment is needed to observe a FBUT?

Answer 21

Slit lamp

Question 22

When the spectacle RX has a cylinder LESS THAN what dioptric value can you consider spherical equivalent?

Answer 22

-1.25D

Question 23

What is the Final CL Rx for the following lens? OD: -2.25 -1.00 x 025

Answer 23

-2.25 -0.75 x 020

Question 24

When a toric lens is observed to be rotated to the left you will add the same number of degrees to the Final Contact Lens RX. T/F

Answer 24

TRUE - left - clockwise - LEFT ADD RIGHT SUBTRACT

Question 25

A weight in the bottom of a soft toric lens would be considered to have stabilization technique?

Answer 25

Prism Ballast

Question 26

How are rigid lens manufactured?

Answer 26

Lathe Cutting