Specialist CL fitting Flashcards
cosmetic cl
colour
enhance
prosthetic lense
produce an iris
hide a scar
hide a tropia
after inoculation
to mask colobama/aniridia
aphakia
no crystalline lens congenitla abnormlaity?? after cataract extraction high +lens with uv filter elderly px? can they hold cl
px with poor VA
albino px- albinism- coloured cl to stop so much light coming in
cl telescope system- high powered - lens- refract px and use high + specs
therepeutic cl
to deliver drug/ metabolic indicators
bandage graft after refractive surgery/ lamella graft
bandage cl in animals, roaaaaar
peadiatric lenses
refractive- try to maintain emmetropisation
congenital/traumatic aphakic
cosmetic therapeutic
peadriatric ocular dimensions
axial lentgh- 17mm 24mm in adults conreal diameter- 10mm- but age 1 it is adult sized corneal radius is 7.1mm adult is 7.9mm chilren have more endothelial cells
irregular corneas due to
keratoconus keratoglobus pellucid marginal degeneration recurrent erosions post corneal surgery? post keratoplasty? Post PKR
how do u find corneal shape
keratomtetry- only central area
therefore we need to do TOPOGRAPHY
corneal mould?????
specialist lens could create tear lens- smooths any irregularities
KERATOCONUS
onset in teens/early 20's runs in family? usually bilateral colagen disorder of the cornea treat with hard/rgp fullc orneal graft after associated with atopy, heredity, aniridia, downs syndrome, mar fans, rp Keratoconusp manifest during cl wear not a direct complication of cl use reduced tolerance to cl EYE RUBBING-
keratometry
oval shaped keratomeric mires
not perpendicular meridians
steepening of cornea>47D
corenal apex norm displaced inferior +laterally
differnce in corneal power usually >1.50D 3mm above and below visual axis
often difference in central corneal power of both eyes is>1.00
