CL Care and Maintenance Flashcards
FDA Group 1
Low water content, non-ionic
FDA Group 2
High water content, non-ionic
FDA Group 3
Low water content, ionic
FDA Group 4
High water content, ionic
why do we have silicon in lenses?
great affinity for oxygen; increases transmissibility of oxygen to our eyes
con of silicon
hydrophobic (repels charged particles and attracts uncharged particles)?
what lens does not belong into any of the FDA groups?
Dailies Total 1
ionic lenses
charged and attracts oppositely charged particles
1234
LHLH
NNII
fda group mneumonic
Fluorine advantage to lenses
attracts water and keeps lens moist; reason why we choose lenses with Fluorine
What filter makes staining easier to visualize?
wratten filter
why do we need to rub the lens?
! Rinsing alone does not detach adherent/penetrating fungi
! Micro-organisms are not the only ‘concern’
! other lens contaminants also require removal
! finger-borne contaminants (←lens handling)
! inevitable surface deposition needs to be contained
! a clean lens is usually more comfortable
! Lens wettability is enhanced

is unpreserved normal saline ok to use for lens care?
no
Any process that kills or eliminates transmissible agents
sterilization
The killing and/or the removal of some or all resident pathogenic organisms
disinfection