Unit 3: Still OTC And Contact Lenses Flashcards
Mucin
Innermost layer
-produced by epithelial cells of cornea and conjunctiva
-provides avascular cornea with nourishment
Aqueous (tear layer)
Middle layer
-produced by lacrimal gland
-lubricates and prevents infection
-thickest part of tear layer
Lipid
Top of tear layer
-produced by meibomian gland
-seals tear film and reduces evaporation
Causes of dry eye disease
-aging
-medications
-digital devices
-environment
-contact lenses
-LASIK surgery
-meibomian gland dysfunction (MGD)
-blepharitis
-reduced aqueous production
Meibomian gland dysfunction
-thickened meibomium
-poor/thin lipid layer
-tear evaporation
Treatments for MGD
-hot compress (frequently)
-expression of meiobian glands
-Omega-3 supplements
-Artificial tears
-Medications
-Lipiflow (machine that heats and pulsates to liquefy meibum and massage to push it out of clogged glands)
Blepharitis (and causes)
Inflammation of skin around the eyelashes
-staphylococcus bacteria, blocked oil glands, hormone problems, allergies, mites (ew)
Treatment of blepharitis
-hot compress
-lid scrubs
-artificial tears
Blepharitis symptoms
-Swollen, itchy, scaly
-Blurred vision
-Watery eyes
-Gritty sensation
Types of contact lenses
-soft
-hard/gas-permeable
-specialty
Kinds of soft contact lenses
-daily wear
-Extended wear
-Disposable wear
-Cosmetic or decorative
-Toric
-Bifocal or multifocal
Why wear hard contact lenses?
Gives better vision
Hybrid lenses
-Soft on edge
-Hard in the middle
-best of both
Sclera lenses
-wider
-Sits on the white part of the eye to avoid touching cornea
-for keratoconus and other corneal issues
Multi purpose solution
For cleaning and storing most soft contact lenses
Hydrogen peroxide solution (HPS)
Cleaning and storing of any type of contact lens
RED CAP
-advantages: best disinfection
-disadvantage: toxic to eye until neutralized
Gas permeable lens care systems
Cleaning and storing hard contact lenses only
RED CAP
Rewetting drops
Artificial tears safe for contact lenses
-some have cleaning products
