Domain III 3: Instrumentation for Measurement and Observation + Domain V: Diagnostic Fitting

Question 1

hemorrhaging and vascular changes in the retina associated with diabetes.

Answer 1

Diabetic Retinopathy

Question 2

a loss of central vision due to an age-related degeneration

Answer 2

Macular Degeneration

Question 3

when the retina tears or loses contact with the choroid

Answer 3

Retinal Detachment

Question 4

a hereditary disorder that affects mainly the rods

Answer 4

Retinitis Pigmentosa

Question 5

A rigid lens showing apical pooling indicates a:

Answer 5

Steep fit

Question 6

A rigid lens showing apical touch indicates a:

Answer 6

Flat fit

Question 7

Under slit lamp evaluation with fluorescein, corneal areas that appear dark and do not hold stain during
blinks are most likely:

Answer 7

dry spots

Question 8

Staining at the inferior portion of the cornea of a soft lens wearer is usually caused by:

Answer 8

improper lens removal

Question 9

What color filter enhances the fluorescein pattern behind a rigid lens containing a UV blocker?

Answer 9

yellow

Question 10

Which slit lamp illumination is performed with the microscope placed precisely along the angle of
reflected light from the eye?

Answer 10

specular reflection

Question 11

Corneal Edema, Overwear Syndrome, Corneal Anesthesia

Answer 11

Complicaitons of Pmma

Question 12

what lens reduces Corneal Edema, Corneal Warpage, Polymegethsim

Answer 12

Gas permeable

Question 13

i) Crisper Vision
ii) More Durable than Soft Lenses
iii) Aftercare of lenses is easier
iv) No need to change lenses every year, lenses can be cleaned and polished
v) Patients are more loyal
vi) Stabilizes Myopia in teenagers and reduces “Myopic Creep”

Answer 13

Advantages of RGP

Question 14

i) Health History
ii) Refraction
iii) Pre-fitting examination with Slit Lamp
iv) Keratometry
v) Lens Options (Spherical Lenses, Toric Lenses) (Rigid or Soft?)

Answer 14

procedure for RGP fitting

Question 15

Fit “On K” or “Steeper than “K”
Diameters 8.5 -9.2
Edges should be well tapered to minimize edge sensation with the upper lid

Answer 15

Intrapalpebral

Question 16

the chord diameter over which the base curve extends on the posterior surface of the contact lens.

Answer 16

Posterior Optical zone

Question 17

If the POZ is kept constant and the CPC is made steeper, Apical Vault is (increased/ decreased)= therefore lens movement is decreased forming a tighter fit

Answer 17

increased

Question 18

Any change in the base curve requires a new lens.

Answer 18

true

Question 19

If the POZ is kept constant and the CPC is made flatter, Apical Vault is (increased/decreased) therefore lens movement is increased forming a looser fit.

Answer 19

decreased

Question 20

If the CPC is kept constant and the POZ is made smaller, Apical Vault will be
(increased/decreased) and therefore increase lens movement.

Answer 20

decreased

Question 21

If the CPC is kept constant and the POZ is made larger, Apical Vault will (increased/decreased)
and therefore decrease lens movement.

Answer 21

increase

Question 22

As diameter increased, the POZ is usually (increased/decreased) accordingly

Answer 22

increased

Question 23

As diameter is decreased, the POZ is usually decreased accordingly, as this occurs,
apical vault (increased/decreased) and loosens the fit of the contact lens.

Answer 23

decreases

Question 24

Any change in thickness requires a new lens

Answer 24

true

Question 25

As thickness (increased/decreased), surface tension will increase causing a tighter fit.

Answer 25

decreases

Question 26

If peripheral curves are made …, this will decrease the size of the POZ, apical
vault will decrease which will loosen fit of the contact lens.

Answer 26

wider

Question 27

Widening peripheral curves (can/can’t) be done by adjustment on the original lens.

Answer 27

can

Question 28

Peripheral curves (can/can’t) be made smaller and will require a new lens.

Answer 28

Can’t

Question 29

If the fitter wants a larger POZ, a new lens will have to be ordered.

Answer 29

true

Question 30

Correction of a Low Riding Lens (Minus Lens)
Intrapalpebral Fit (Lens may be too flat)

Answer 30

steepen base curve

Question 31

Correction of a Low Riding Lens (Minus Lens)
Upper Lid Attachment (Lens may be too steep)

Answer 31

Flatten base curve or increase lens diameter or combination of both

Question 32

thickness (increases/decreases), this will loosen the fit of the lens.

Answer 32

Increases