Week 6 - Therapeutic lenses

Question 1

Wearing scleral lenses causes an accumulation of mucus especially at the start of wearing them. T/F

Answer 1

TRUE

Question 2

Rigid lenses (corneal or scleral) can correct visual loss in patients suffering from Congenital or developmental abnormalities of the cornea (primary corneal ectasia, Keratoconus, Keratoglobus and cornea plana). T/F

Answer 2

TRUE

Question 3

Corneal epithelial pain can be severe and disabling.

When does a soft bandage (silicone hydrogel/hydrogel) lens help with corneal epithelial pain?

Answer 3

when it is recurrent and persistent

Question 4

Why does a therapeutic bandage lens help with someone suffering from recurrent erosion syndrome?

Answer 4

reduces the friction between the lid and cornea

Question 5

How long will be a sufficient amount of time before recurrent erosion syndrome to stop?

Answer 5

three months of extended-wear bandage lens

Question 6

What is the most common epithelial dystrophy?

Answer 6

Epithelial basement membrane dystrophy

Question 7

What can Corneal trauma or surgery that has depleted endothelial functional
reserves can lead to?

Answer 7

epithelial bullous keratopathy

Question 8

What are therapeutic lenses used in conjunction with to help with chemical injuries?

Answer 8

when used with topical medications under close supervision

Question 9

If someone has tear deficiency what kind of therapeutic lens material/types should we use? 2

Answer 9

Silicone hydrogel (low-water-content) lenses
scleral lenses

Question 10

If a px suffers from eyelid deficiency the cornea can be exposed and dry. T/F

Answer 10

TRUE - a therapeutic lens can help with the exposed dry cornea

Question 11

If the anterior chamber is shallow or absent how should we fit a cls?

Answer 11

slightly flatter, change to be slightly steeper than as the chamber reforms and the cornea steepens

Question 12

A small aqueous leak following surgery or trauma can often be sealed with therapeutic lenses. T/F

Answer 12

TRUE

Question 13

What material is widely used following PRK & LASEK surgeries? why?

Answer 13

-silicone hydrogel lenses
-very high gas permeability, which minimizes the induced hypoxic and hypercapnic stress

Question 14

How often should you observe a cls used for therapeutic uses?

Answer 14

day after fitting and not more than 1 week after that

Question 15

What are 3 primary uses of a therapeutic lens?

Answer 15

-relief of pain/discomfort
-assistance in healing injured or diseased ocular tissue
-improvement of vision in unusual or distorted corneal shapes

Question 16

Which type of cl is commonly used to manage keratoconus?

Answer 16

RGPS

Question 17

For which condition are soft bandage lenses typically used to reduces friction and promotes healing?

Answer 17

recurrent corneal erosion syndrome

Question 18

Which material is often preferred for therapeutic lenses in a dry ocular environment?

Answer 18

silicone hydrogel low water content lenses

Question 19

What is the primary purpose of scleral lenses in the treatment of tear deficiency?

Answer 19

to cover the entire cornea and surface of the eye, maintaining a precorneal fluid reservoir

Question 20

Which condition is characterized by a flat cornea that affects vision and often requires RGP or scleral lenses?

Answer 20

cornea plana

Question 21

What is the best lens choice for managing epithelial bulluos keratopathy?

Answer 21

hydrogel or silicone hydrogel lenses

Question 22

What does a dystrophy affecting the corneal epithelium usually result in?

Answer 22

pain or discomfort that can be relieved with soft lenses