Test Review For Conact Lens Technicians

Front 1

The following is an example of what type of astigmatism?
K's 42.50 @ 180 / 40.50 @ 90

Back 1

Against-the-rule astigmatism

Front 2

The average pH value of the human tear is:

Back 2

7.4

Front 3

The main supply of oxygen to the corneal epithelium is derived from the:

Back 3

Tear film

Front 4

Which auxiliary trial lens will extend the keratometer range to approximately 30.00 D?

Back 4

-1.00

Front 5

The following is an example of what type of astigmatism
K's 44.00 @ 180 / 44.50 @ 90
Rx -3.00 -2.50x180

Back 5

Lenticular astigmatism

Front 6

The cornea has five distinct layers. In order from anterior (front) to posterior) back they are:

Back 6

Epithelium, Bowman's layer, Stroma, Descemet's membrane, Endothelium

Front 7

The normal cornea is transparent due to the pump action creating proper fluid balance. Which layer of the cornea is most responsible for maintaining this function?

Back 7

Endothelium

Front 8

Which auxiliary trial lens will extend the keratometer range to approximately 61.00D?

Back 8

+1.25 D

Front 9

In against-the-rule astigmatism, the steepest corneal median is at or near:

Back 9

180 degrees

Front 10

In an alignment lid attachment GP fit, the fluorescein pattern should show:

Back 10

A thin, even layer of fluorescen and less than 180 degrees of bearing in the mid-periphery

Front 11

In a GP wearer, an arcuate stain on the cornea may be due to:

Back 11

Poorly blended secondary curves

Front 12

Which keratometer reading indicates with-the-rule-astimagtism?

Back 12

44.00@175 / 44.50 @ 85
48.00@ 45 / 46.50 @ 135
(44.50 @ 15 / 44.75 @ 105)
46.00 @ 180 / 46.00 @ 90

Front 13

Amy's +8.50 D spectacles sit 12 mm from the cornea. The power of a soft contact lens for Amy properly vertexed, would be:

Back 13

+8.00 D
+8.50 D
(+9.50 D)
+11.00 D

Front 14

Which of the following set of lens specifications would best stimulate an intrapalpebral GP fitting given the following information
K's 42.00 @ 180 / 43.00 @ 90
RX -2.0 -1.00 x 180

Back 14

(42.50 -2.50 8.5)
41.50 - 1.50 8.5
42.00 -2.00 9.5
41.50 -1.50 9.5

Front 15

Which contact lens would best correct this patient's visual needs, given the following information:
K's 46.00 @ 180 / 45.50 @90
Rx -3.00 -1.50 x 90

Back 15

A soft spherical lens
(A soft toric lens)
A back surface toric GP lens
A front surface toric GP lens

Front 16

If a patient has 1.50 D of refractive cylinder and keratometer readings of 44.00 @ 180 / 44.50 @ 90, you would expect a spherical gas permeable lens to:

Back 16

Give them their best correctable vision
(Result in a residual astigmatism)
Ride nasally
Ride temporarily

Front 17

Rx OU -3.00 -0.50 x 18, Add +1.25 D
If spherical soft lenses are being fit using the monovision technique, what is the desired power for the eye fitted for the near?

Back 17

(-2.00)
-3.25
+1.25
-1.75 -0.50 x 180

Front 18

Which edge design is recommended for a +15.00 D aphakic GP lens

Back 18

Hyperflange
(Lenticular myoflange)
Concentric Design
Intrapalpebral Design

Front 19

Which of the following lens designs would provide the best visual result for this patient?
K's 4200 @ 180 / 42.50 @ 90
Rx -3.50 -1.75 x 180

Back 19

Spherical gas permeable lens
Spherical soft lens
(Soft toric lens)
Back surface toric gas permeable lens

Front 20

A prism ballast GP lens requires how much prism for proper orientation?

Back 20

(0.75 to 1.50 D)
+3.00 D at 6 oclock
1.50 to 3.00 D
Always 0.75 D

Front 21

Given the following information which set of lens specifications would best stimulate a lid attachment rigid lens fitting?
K's 42.00 @ 180 / 43.00 @ 90
Rx -2.00 -0.87 x 180
Upper lid positioned 2mm below the superior limbus

Back 21

(41.50 -1.50 9.5)
42.50 -2.50 8.5
43.00 -2.50 9.5
43.00 -3.00 8.2

Front 22

Given the following information which of the following GP lens designs would you order to best correct this patients vision?
K's 45.00 @ 180 / 42.00 90
Rx -2.00 - 4.25 x 90

Back 22

45.00 - 2.00
42.00 - 2.00 - 4.25 x 90 prism ballasted
42.00 -2.00
(42.00 / 45.00 -2.00 / -5.75 drum readings)

Front 23

Given the following information which of the following GP lens designs will best correct this wearers vision?
K's 42.50 @ 180 / 42.50 @ 90
Rx -3.00 -1.00 x 90

Back 23

Bitoric design
(Anterior toric design)
Spherical design
Soper cone design?

Front 24

given the following refraction and K readings, select the correct base curve and power recordings (drum readings)
K's 44.00 @ 180/ 41.00 @ 90
Rx -1.00 -3.00 x 90

Back 24

41.00 / 44.0 -1.00 / -3.00
(41.00 / 44.00 -1.00 / -4.00)
41.00 / 44.00 - 4.00 / -1.00
44.00 / 41.00 -1.00 / -3.00

Front 25

In which of the following types of corneal astigmatism is a GP lens most indicated?

Back 25

(Irregular)
With-the-rule
Against-the-rule
Oblique

Front 26

The following ametropia frequently results in high riding rigid lenses:

Back 26

(High myopia)
High hyperopia
Aphakia
Prespyopia

Front 27

A good example of a bifocal contact lens that may rotate without vision impairment is:

Back 27

(Aspheric)
Executive
Fused Crescent
Translating

Front 28

Given the following information:
K's 42.00 @ 180 / 42.00 @ 90
Rx - 3.00 -2.00 x 180

Back 28

A back toric GP lens for optimum visual acuity
A bitoric GP lens for optimum visual acuity
A soft spherical lens because the patient has a spherical cornea
(A front surface toric GP lens to correct the residual astigmatism)

Front 29

Which special GP lens design would be beneficial for this patient given the following information?
K's 44.00 @ 180 / 46.50 @ 90
Rx -11.00 +2.50 x 90

Back 29

(Hyperflange)
Back toric design
Thick edge design
Myoflange

Front 30

The tolerance for the overall lens diameter according to the ANSI standards is:

Back 30

+/- 0.005mm
(+/- 0.05mm)
+/- 0.01mm
+/- 0.1mm

Front 31

When are soft lenses contraindicated?

Back 31

When the patient has irregular corneal astimatism

Front 32

The instrument used for magnification of the edge of a rigid contact lens is a?

Back 32

Keratometer
(Shadowgraph)
Profile analyzer
V-groove guage

Front 33

The tolerance for a rigid lens power under +/- 5.00 D is:

Back 33

(0.12 D)
0.25 D
0.37 D
0.50 D

Front 34

A warped lens will show ____________ base curves on the radiuscope and a _________ power on the lensometer.

Back 34

One / spherical
Two / sphero-cylindrical
One / sphero-cynlindrical
(Two / spherical)

Front 35

Which type of lens would best satisfy this patients visual needs given the following information:
K's 43.00 @ 160 / 44.00 @ 75.3+ distortion
Rx -2.00 +1.00 x 75

Back 35

Spherical soft lens
Soft toric lens
Soft bifocal lens
(Spherical GP lens)

Front 36

A rigid contact lens measures +15.00 D BVP. The FVP will measure:

Back 36

(a lesser dioptric reading)
a great dioptric reading
an identical dioptric reading
an astigmatic reading

Front 37

The base curve of a rigid lens was orderd 7.84mm and was received measuring 7.94mm. This lens is _______ than ordered

Back 37

0.50 D steeper
1.00 D steeper
(0.50 D Flatter)
1.00 D flatter

Front 38

Jill is wearing a rigid lens with the base curve of 44.00 D and a power of +3.00 D sphere. She requires an over-fraction of -0.50 D and the lens needs to be steepened by 0.50 D. What parameters should be ordered for the new lens?

Back 38

44.00 +2.50
(44.50 +2.00)
44.50 +4.00
44.50 +3.00

Front 39

Which of the following preservatives produces the least toxic response of the eye?

Back 39

sorbate or sorbic acid
(polyquad)
chlorhexidine
thimerosal

Front 40

If 3% generic hydrogen peroxide is substituted for the solution in one of the FDA-approved hydrogen peroxide care systems:

Back 40

The solution will not neutralize properly
(The solution may discolor the lens)
The lenses may disintegrate
The patient may develop GPC

Front 41

Use of a Wratten #12 or Tiffen yellow filter sis important in evaluating the fluorescein pattern of patients with GP lenses because:

Back 41

(Many patients are wearing lenses containing UV inhibitors that block fuorescein)
There will be too much fluorescence if a filter is not used
3 and 9 oclock staining will not show up if the filter is not used
the filter will help to identify patients with corneal warpage

Front 42

Three and nin oclock staining in GP lens wearers can best be elimninated by:

Back 42

(Reducing center and edge thickness and teaching the patient to blink completely)
Adding a minus carrier to the lens
use preservative-free saline instead of GP wetting/soaking solution
Using a single-cut rather than multicurve lens design

Front 43

The slit lamp illumination that gives an overall view of the cornea but limits its detail is:

Back 43

Sclerotic scatter
(diffuse)
Specular reflection
Oscilatory

Front 44

Gross corneal edema, which manifests itself clinically as central corneal haze, is verified by the slit lamp using sclerotic scatter illumination. What specific technique does the examiner use to see this condition?

Back 44

(The naked eye and an angle between the slit lamp beam and the eye of 90 degrees)
The blue cobalt filter of the slit lamp and an angle of about 45 degrees
The green filter of the slit lamp with high magnification
High magnification and an angle between the beam and scope of 180 degrees

Front 45

When inspecting the blend on the bevel of a GP lens with a fluorescent tube

Back 45

The lens must be held so the reflection of light on the anterior surface of the lens falls centrally on the lens
the fluorescent tube should be behind and below the examiner
(an ideal blend should show a J-shaped or ski pattern in a smooth curve)
In order to get the reflection continuous to the edge of the lens it must never be tilted

Front 46

Mary is wearing a gas permeable lens with a base curve of 43.50 D and a power of +2.75 D. She requires a -0.75 D sphere over this lens. If you wish to order her a new lens with a curve of 43.00 D, what will the new power be?

Back 46

+1.50 D
+2.00 D
(+2.50 D)
+3.00 D

Front 47

Which type of slit lamp illumination will allow you to determine corneal thickening, thinning, and distortion and depth of foreign bodies or opacities in the cornea?

Back 47

Diffuse illumination
(Optic Section)
Retro-illumination
Conical beam

Front 48

When evaluating fuorescein patterns, a special filter must be used with?:

Back 48

Silicon acrylates
Polymethylmethacrylate
(Polymers with a UV blocker)
Hydroxyethl methacrylate

Front 49

A patient with a high degree of with-the-rule astigmatism fitted with spherical gas permeable lens will show touch of:

Back 49

(On the horizontal meridian)
On the vertical meridian
On the oblique meridian
On the residual meridian

Front 50

A rigid lens showing apical touch is an indication of:

Back 50

A steep fit
A intrapalpebral fit
(A flat fit)
An astimgatic fit

Front 51

A rigid lens showing excessive apical pooling is an indication of:

Back 51

(A steep fit)
An alignment fit
A flat fit
An astigmatic fit

Front 52

Contact lenses that have a non-spherical back surface are called:

Back 52

(Aspheric lenses)
Tricurve lenses
Truncated lenses
Spherical lenses

Front 53

In order to craet a smooth blend between intermediate and peripheral curve of the following contact, which radius tool should be used?
CPC 7.50mm (45.00 D), IPC 8.5mm, PPC 10.50mm

Back 53

8.5mm
(9.5mm)
10.2mm
11.5mm