Week 6 - Therapeutic lenses Flashcards
Wearing scleral lenses causes an accumulation of mucus especially at the start of wearing them. T/F
TRUE
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
TRUE
Corneal epithelial pain can be severe and disabling.
When does a soft bandage (silicone hydrogel/hydrogel) lens help with corneal epithelial pain?
when it is recurrent and persistent
Why does a therapeutic bandage lens help with someone suffering from recurrent erosion syndrome?
reduces the friction between the lid and cornea
How long will be a sufficient amount of time before recurrent erosion syndrome to stop?
three months of extended-wear bandage lens
What is the most common epithelial dystrophy?
Epithelial basement membrane dystrophy
What can Corneal trauma or surgery that has depleted endothelial functional
reserves can lead to?
epithelial bullous keratopathy
What are therapeutic lenses used in conjunction with to help with chemical injuries?
when used with topical medications under close supervision
If someone has tear deficiency what kind of therapeutic lens material/types should we use? 2
Silicone hydrogel (low-water-content) lenses
scleral lenses
If a px suffers from eyelid deficiency the cornea can be exposed and dry. T/F
TRUE - a therapeutic lens can help with the exposed dry cornea
If the anterior chamber is shallow or absent how should we fit a cls?
slightly flatter, change to be slightly steeper than as the chamber reforms and the cornea steepens
A small aqueous leak following surgery or trauma can often be sealed with therapeutic lenses. T/F
TRUE
What material is widely used following PRK & LASEK surgeries? why?
-silicone hydrogel lenses
-very high gas permeability, which minimizes the induced hypoxic and hypercapnic stress
How often should you observe a cls used for therapeutic uses?
day after fitting and not more than 1 week after that
What are 3 primary uses of a therapeutic lens?
-relief of pain/discomfort
-assistance in healing injured or diseased ocular tissue
-improvement of vision in unusual or distorted corneal shapes
Which type of cl is commonly used to manage keratoconus?
RGPS
For which condition are soft bandage lenses typically used to reduces friction and promotes healing?
recurrent corneal erosion syndrome
Which material is often preferred for therapeutic lenses in a dry ocular environment?
silicone hydrogel low water content lenses
What is the primary purpose of scleral lenses in the treatment of tear deficiency?
to cover the entire cornea and surface of the eye, maintaining a precorneal fluid reservoir
Which condition is characterized by a flat cornea that affects vision and often requires RGP or scleral lenses?
cornea plana
What is the best lens choice for managing epithelial bulluos keratopathy?
hydrogel or silicone hydrogel lenses
What does a dystrophy affecting the corneal epithelium usually result in?
pain or discomfort that can be relieved with soft lenses
