Therapeutic Lenses Flashcards
which property is important in bandage contact lenses in regards to the amount of time (EW) they’ll be on the eye?
HIGH Dk/t
- need high transmissibility SiHy
- Airoptix N+D, PureVision, AV Oasys
three instances where you’d intentionally use a HIGH water content lens:
HIGH water content - DRIES up (sucks up water from cornea)
- Fuch’s, trauma i.e. PRK (epi swelling), RCE
- other: chronic glaucoma, aphakic/pseudophakic bullous keratopathy
three instances where you’d use a LOW water content lens:
give the eye a bath
-hydration therapy/DES, exposure keratitis, trichiasis, corneal dystrophy (discourage RCE), dellen
when lens movement is LESS desirable, what parameter would you choose to i.e. manage pain, epithelial abrasions, RCEs
lens diameter - would choose LARGER LD to increase fit stability and protect the eye more
You use a bandage CL for a corneal abrasion pt. What else should you do/Rx before sending them home?
topical ABx to prevent secondary infection
Bandage CL used for RCE patient. What’s the underlying CAUSE of RCE? Purposes of the bandage cl?
- Poor adherence of hemidesmosomes
- purposes: protection, pain reduction, promotion of healing
what is bullous keratopathy? Could you use a Bandage CL for it?
rupture of DESCEMET’S membrane; influx of aqueous humor into cornea –> EDEMA. Very painful d/t exposure of corneal nerves.
Yes, use high water content Bandage CL to soak up AH and reduce pain
would you use a bandage CL in the case of minor DES? How about Keratoconjunctivitis sicca?
no - usually SCLs exacerbate DES.
-If KSicca is SEVERE (or Sjogren’s for example) - use a low water content lens
What is SLK of theodore?
Where on the eye/cornea does it affect most?
Bandage CL implications?
chronic, bilateral middle-aged women w/ thyroid problems
- staining of SUPERIOR (SLK) limbal cornea w/ surrounding bulbar injection (painful, burning, etc.)
- bandage CL used to act as PROTECTIVE barrier
SPK of Thygeson: SPK of ____ etiology. Bilateral, lasting months-years. Purpose of bandage CL?
unknown etiology
- promote healing, relieve pain
- Rx steroids for acute cases
Filamentary Keratitis - ___ strands dragged across the cornea on each blink. Would Rx what else in addition to bandage CL?
mucin strands
-steroids, cyclo
T/F: There is a cosmetic lens that aids in color deficiencies (R/G deficiency)
True - the X-chrome!
- deep red lens worn over NON-dom eye to shift spectral sensitivity - increase luminance differences
- contraindicated in amblyopes, monovisions pts, or binoc vision problems
