Question | Answer |
This type of astigmatism is total astigmatism and is found in spectacle Rx? | Refractive astigmatism |
this type of astigmatism is the difference between k's found on the cornea? | corneal astigmatism |
this type of astigmatism is tilting or toric crystalline lens? | lenticular astigmatism |
this is tilted fovea or irregular shape macula? | internal astigmatism |
this type of astigmatism is not 90 degrees apart and is corrected with gp or pmma | irregular astigmatism |
know wra/ara/oblique astigmatism | :) |
know how to fit/apply/remove GP,soft, and hybrid lenses | notes |
know how to select the best lenses for a patient!! | ex
the ten point quizzes in lab |
what are the 2 fitting philosophies | 1.intrapalpebral/apical clearance
2.uppperlid/corneal attatchement |
when fitting with the intrapalpebral/ apical clearance fit , the lens fits between the ____ & _____ lid and centers well | upper;
lower |
when fitting with the mean you take corneal cyl and divided by _____ then fit flat k steeper by that amount | 2 |
mean of the mean you take the corneal cyl and divide by ____ then fit flat k by that amount | 4 |
upperlid /corneal attachment has a large dia of ? | 9.5 |
upperlid attachment has a _____ bc? | flatter |
with upperlid attachment the lens is postitioned under the ___ lid which makes it more comfortable because the blink is more natural. | upper |
upperlid has reduced flare which makes it easier to adapt and has less ____ & ___ o'clock staining | 3&9 |
what are the 4 steps of lens evaluation? | 1.corneal centration
2.movement
3.fluorescein
4.visual aquity |
average dia for intrapalpebral /apical fit ? | 8.5 |
know how to deliver a contact lens | :) |
dk/t or dk/l means what | oxygen transmission of a cl in relation to its thickness |
describe a hybrid lens? | a gp center surrounded by a soft skirt for comfort |
can you polish a GP | YES |
do GPs have better long term comfort when comparing to soft lens? | YES |
do GPs have better optics? | YES |
are GPs easier to care for | YES |
GP lenses correct irregular and regular astigmatism using a ____ lens? | sphere |
can you polish /modify a GP lens? | yes |
when you first start wearing a GP lens you wear it _____ hours the first day then add an hour each day? | 3 |
the follow ups for a gp lens is ___ week
___ weeks
__month
_months
__months
every 6 months | 1.
2
1
2
3 |
when fitting a soft lens choose a dia ____mm larger than the HVID | 2 |
soft contact lenses should always be in ____ cylinder | minus |
compensate VD if ____ D or greater | 4.00 |
multifocals will not restore someones vision to their ____ vision | youthful |
anisometropic lenses are another name for what type of lenses? | monovision |
are monovision lenses easier to fit than bifocals | YES |
are there more material choices for monovisions? | YES |
can you get monovisions in sphere /torics or both? | BOTH |
which has a wider field of view monovisions or bifocals? | monovisions |
which is less expensive monovisions or bifocals? | monovisions |
this type of lens is one single vision lens for dv or near | monovision |
what are the two basic types of bifocal lens designs? | 1.alternating vision/translating bifocals
2.simultaneous vision |
segmented lenses are more challenging because they need better ____ height measurements? | seg |
fitting a GP alteranting lens? (6 steps in order) | 1.examine lid position
2.record K's
3.evaluate fit
4.observe the seg placement
5.over refract
6.record BC,power,dv/nv, dia, sh,prism ballast |
the lower the evalue the ____ the fit | tighter |
the higher the evalue the ___ the fit | looser |
hyperflange is used on a _____ lens? | minus |
hyperflange provides centration for __ riding lenses? | high |
hypoxia means ? | lack of oxygen |
diameter gauge, slot gauge, v-groove,shadowgraph, projection magnifier, hand held magnifier are instruments used to determine what? | diameter |
measuring magnifier, loupe, and shadow graph is used to determine what? | OZ |
thickness gauge and dial gauge are used to determine what? | center thickness |
5 groups water groups ? | 1.low water nonionic
2.high water nonionic
3.low water ionic
4.high water ionic
5.silicone hydrogel |
does ionic or nonionic attract more deposites? | ionic |
follow ups for a soft lens? | 1 week;
1 month;
3 months;
6 months;
12 months |
aldox kills? | acanthomeba |
polyquad is found in which manufactures products? | ALCON |
silicone is added for ____ permeability? | oxygen |
fluorine is used to increase ____ and deposit resistant. | wetablilty |
start thinking about fitting a soft toric if the refracted cyl is _____? | -0.75 |
if the refracted cyl is over -1.00 definityly fit a soft _____? | toric |
lars stands for ? | left add ; right subract |
dk value of 30 is ____
dk value of 151 is _____? | low/high |
if a lens is high water it has more oxygen which means it has more _______? | deposits |
acrylate is usually in context with what type of lens? | GP |
if the refracted cyl is a -.25 or -.50 ______ is usually used | spherical equivalence |
if refracted cyl is 0.75 or 1.00 fit ___ or toric | sphereical equivalence |
compensate for VD if GREATER THAN _____(sphere only) | 4.00 |