Domain V 2: Diagnostic Fitting Flashcards
Correction of a High Riding Lens (Minus Lens)
Intrapalpebral Fit (Lens may be too flat)
Note: This is if edge of lens is slightly under
upper lid
Steepen base curve or increase lens diameter
Correction of a High Riding Lens (Minus Lens)
Upper Lid Attachment (Lens may be too flat)
Steepen base curve or increase lens diameter or a combination of both
Thin out edge design (CN Bevel or Hyperflange design)
GP lenses need to be disinfected for a minimum of … hours after wearing
4
Prior to delivering lenses to a patient, GP lenses should soak overnight in order for the lenses to be more … prior to the patient wearing their lenses
wettable
GP lenses should be cleaned and polished professionally once a ….
year
Adjustments to an original lens:
i) Cut down diameter
ii) Increase PC width, reduces POZ
iii) Reduce POZ
iv) Round out edges
v) Clean and Polish scratches
vi) Smooth out peripheral curves
vii) Add .50 to- 1.00 of minus power
viii) Add +.50 to Plus lenses
true
Adjustments that require a new lens:
i) Increase Diameter
ii) Change Center Thickness
iii) Make POZ larger
iv) Add more than 1.00 of minus power
v) Add more than.+.50 of plus power
vi) Any change to the Base Curve
true
refers to the inherent permeability of a lens material to allow the passage of gases through
it.
Dk
This direct illumination is useful for examining the lens surface.
Parallelpipped
A spherical RGP lens fit on K shows fluorescein pooling under the superior and inferior portions of the
contact lens, and a dark band of minimal fluorescein horizontally. What kind of astigmatism does this
pattern represent?
with-the-rule
A contact lens technician uses the slit lamp to view all of the following except:
A. fundus
B. corneal scars
C. corneal neovascularization
D. the conjunctiva
A. fundus
The fitter needs to place the lens on the patient’s eye for the initial evaluation and allow the lens to settle for
… minutes.
20
What filter is used to evaluate a diagnostic lens with the use of fluorescein?
cobalt
If a lens demonstrates edge lift, what may be the problem with the lens?
too flat
What is a sign of a steep fitting lens?
circumcorneal indentation
