Final Exam New Material Flashcards
What are some quality of life concerns of dry eye disease?
- similar to those undergoing dialysis or enduring disabling hip fractures
- Sjogren’s patients have an increased risk of anxiety and depression
- potential for severe economic loss through decreased worker productivity
What are the two types of dry eye and what percentage of dry eye sufferers are attributed to each?
- aqueous deficient dry eye (ADDE) accounts for 14% of dry eye sufferers by itself
- evaporative dry eye (EDE) accounts for 50% by itself, and 86% are at least partially EDE sufferers
What is aqueous deficient dry eye?
an overall decrease in lacrimal gland secretion due to several factors such as low androgens, aging, autoimmune disease, etc.
What is evaporative dry eye?
high evaporation of tears due to several underlying causes such as anterior blepharitis, MGD, ocular rosacea, poor blinking, etc.
Complaints of dry eye sufferers (9)
- burning, stinging, dry, sticky lid, gritty
- short wear time with lens
- transient blur
- painful A&R, difficult lens removal
- increase blinking
- photophobia
- epiphoria
- ocular fatigue/discomfort
- injection
Contributing factors that lead to dry eye (10)
- old age
- female gender (pregnancy, labor, etc.)
- environment (running AC, fans)
- poor diet
- anterior segment disease (allergies)
- medications
- systemic disease (RA)
- refractive surgery
- smoking
- caffeine
- alcohol
Topical medications that may induce or worsen DED? (12)
- adrenergic agonists
- anti-allergics
- anti-virals
- beta-blockers
- carbonic anhydrase inhibitors
- cholinergic agonists
- decongestants
- miotics
- mydriatics/cycloplegics
- prostaglandins
- topical and local anesthetics
- topical ocular NSAIDs
the pathogenesis (inflammatory pathway) of dry eye
1) increased tear osmolarity –> stress signaling pathways in epithelium and resident immune cells
2) dendritic cell maturation and migration to draining lymph nodes
3) priming of autoreactive CD4-postiive T-cells that home to ocular surface, involving ICAM-1 binding to LFA-1
4) activation of T-cell mediators: IFN-gamma causes goblet cell loss and epithelial apoptosis; IL-17 causes corneal epitheliopathy
5) inflammatory mediators (IL-1, IL-6, IFN-gamma) that decrease the threshold of corneal nociceptors, making them more sensitive to innocuous environmental stimuli –> discomfort
properties of NaFl staining
- water-soluble dissolved in aqueous
- adheres to dead epithelial cells (breaks or loss)
properties of rose bengal staining (4)
- has mild anti-viral effect
- stains dead and devitalized cells
- stains cells that have lost their mucus surface
- stings
properties of lissamine green staining (3)
- stains dead and degenerated cells
- does not stain healthy cells
- stains mucous-free areas
management of mild aqueous deficiency
- AT support
- environmental modifications
management of moderate aqueous deficiency (4)
- frequent ATs or gels with increased contact time
- topical anti-inflammatories/secretagogues
- punctum occlusion
- nasal stimulator
management of severe aqueous deficiency (7)
- ATs or gels
- topical anti-inflammatories/secretagogues
- punctal occlusion
- nasal stimulator
- autologous serum
- amniotic membrane
- scleral lens
options for artificial tears (3 types)
- electrolytes
- ointments
- gels
what do electrolyte ATs do? (3)
- treat ocular surface damage secondary to DES
- potassium and bicarbonate are critical to maintaining K thickness, increase goblet cell density, increase corneal glycogen content, decrease tear osmolarity, decrease tear staining on conj
- Bion Tears and Thera-Tears restore the epithelial barrier function and maintain the mucin layer on the conj
What do ointment ATs do? (4)
- high viscosity solutions provide long relief
- good for kids (less tear wash-out)
- bedtime use
- mineral oil and petrolatum combinations
What do gel ATs do? (3)
- high molecular weight cross-linked polymers
- good retention with less blur
- methylcellulose and PVA to increase contact time
BAK (preservative) properties (3)
- not great, found in tons of ATs
- used for mild dry eye
- well documented toxicity (increases drug penetration)
EDTA (preservative) properties
- augments preservatives in other formulations
- CA2 chelator - binds and inactivates
- may not work for moderate to severe dry eye
Thimerosal (preservative) properties
- sensitivity to mercury component - toxicity (used in Viroptic)
Polyquad (preservative) properties
- less toxic
- usually in Alcon products
- molecule is 4X bigger, so doesn’t penetrate a lot of things
single dose of BAK can ____ affect TBUT _________________
- adversely
- by as much as 4 seconds in 3 hours
What are the “vanishing preservatives” and what are their properties?
- Sodium chlorite (Purite) degrades to chloride and water in UV
- Sodium perborate degrades to water and oxygen when touches the tear film
- BUT may not work in severe dry eye when there’s not enough tear film