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CL_Test1 Flashcards

1
Q

Define emperical

A

Using information from the primary care or prefit examination
Needing to order things

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2
Q

Why are hydrogel lenses so popular?

A

Minimum adaptation period

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3
Q

Define Diagnostically

A

placing diagnostic lenses on the eye

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4
Q

Which BC do you use for a pt with a steep K?

A

8.3 and 8.4

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5
Q

Which BC do you use for a pt with a flat K?

A

8.9 and 9.0

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6
Q

Which BC do you use for a pt with a normal K?

A

8.6, 8.7

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7
Q

What diameter do you desire for your pts?

A

1mm larger than Horizontal visible iris diameter (HVID)

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8
Q

What is the common diameter available for contacts?

A

13.8 to 15.0mm

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9
Q

Mvt: Does a thin or thick lens move more on the eyeball?

A

Thick lens

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10
Q

Purpose of push up test?

A

To assess mvt of lens when mvt is marginal

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11
Q

What are some hints to tell you that a CLs is too tight?

A

Conj drag
Bubbles
Wrinkles

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12
Q

Does a steeper BC lead to a tighter or looser fit?

A

Tighter fit.

Smaller in mm, larger in D

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13
Q

What does it mean if a lens has a larger diameter?

A

It has a larger sag depth.

THus, it has a tighter lens fit

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14
Q

Dispensing appt vs follow up CLs appt; at which is SLE done early?

A

Dispensing appointment.

Need to make sure there was not any infiltrate before putting the contacts on the eye.

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15
Q

Which lens do you use in dusty environments?

A

Spherical SOft lenses

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16
Q

Which lens is commonly used for pts with lenticular astigmatism?

A

Hydrogel toric lenses

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17
Q

What are some alternate names for the Hand magnifier?

A

Lupe
7x to 10x reticule
comparator

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18
Q

What do you verify BCR with?

A

A template projection unit aka soft lens analyzer

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19
Q

What is the weakness between the template projection unit and thin lens?

A

Thin lens may conform to all surfaces

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20
Q

What do you verify center thickness with?

A

Radiuscope

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21
Q

Can you utilize hydrogel lens w/ a radiuscope?

A

Nope, it is too fragile

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22
Q

What instrument measures the water content percentage?

A

Refractometer.

We don’t do in clinic. We get from manufacturer.

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23
Q

What appearance is the lens w/ protein deposit?

A

Cloudy, opaque appearance

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24
Q

What appearance is the lens w/ lipid deposit?

A 
Looks shiny
Greasy appearance (reflections)
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25
What appearance is the lens w/ JELLY bump deposit?
lipid or lipid calcium | Common wih high water ionic lenses for EW
26
What appearance is the lens w/ environmental deposit?
nicotine | cosmetics
27
What appearance is the lens w/ fungus deposit?
Filamentary pattern
28
What is the name of the system used to classify lens deposit?
Rudko
29
What is a rudko score of I
Non detectable film or deposit?
30
What is a rudko score of iV
Detectable under normal illumination wet or dry
31
What is a clear lens with opaque pupil used for?
Penalization therapy
32
What is a milky white discoloration?
Protein Lipid Calcium
33
T/F? | Oxygen permeability is inherent to the material, it has nothing to do with thickness
True
34
T/F? | Transmissibility is not affected by thickness
False
35
What is the abbreviation for oxygen permeability?
Dk
36
What is the abbreviation for oxygen transmissibility?
Dk/L or Dk/T | L or T represents thickness
37
T/F? | DK/T is related to thickness and material of the lens?
True
38
T/F? | Thickness varies with power and the location on lens
true
39
DONT't FORGET
Effectivity: need to do based on resultant. | Vertex compensation
40
Formula for keratometer power?
``` F = n'-n / r or .3375/r = D ```
41
Effectivity for going from specs to CLs
Fcl = Fspec/ 1-dFspec
42
Formula for Tear Lens
TL = BCR - K
43
Name the 5 types of CLs options
``` Hydrogel sphere Hydrogel toric GP sphere GP front surface toric GP back surface toric or bitoric ```
44
Which are the lenses of choice for lenticular astigmatism?
Hydrogel toric
45
Is it possible for part time contact lens wearers to adapt to RGP?
Nope
46
Name some rigid lens failures
1. Comfort 2. 3-9 oclock staining in symptomatic pts 3. Poor lens centration
47
What is the Bescherer twist test?
Predicts soft toric lens success
48
What is considered a critical observer for the Bescherer twist test?
+/- 5 degrees. | This patient must accept compromised vision
49
T/F? | COnsider lens trial with spherical lens if the cyl component is less than 25% of the spherical refractive power.
True
50
T/F? | If the spectacle syle is greater than the corneal cyl, a hydrogel lens is commonly employed.
It corrects the residual astigmatism that would remain if a spherical GP lens was fitted.
51
T/F? | If the spec cyl amount is less than or equal to the corneal toricity, a GP lens has historically been used.
True
52
When to use a bitoric GP lens?
When u have a sig amt of corneal cyl Corneal cyl is greater than or equal to 2.50D It may also correct a sig amt of spec cyl.
53
Which lens do u recommend if a pt has irregular astigmatism?
GP lens
54
Name some examples of irreg astig?
Keratoconus Post surgical or post trauma Any type of ectasia
55
Which is a common stabilizing technique?
Prism ballasting
56
Name the lens stabilizing techniques
``` Prism ballasting Periballasting OAD Truncation Thin zones ```
57
Which is the least common stabilizing technique?
Truncation. | Lens has a looser fit; thus they make with steeper BCR.
58
What are the advantages for prism ballasting?
Better with oblique axis
59
What are the disadvantages for prism ballasting?
Lens thicker inferiorly | Reduced oxygen transmission. - need to monitor for neo
60
Describe dynamic stabilization or double thin zones
Thick in the center | Thin on the edges by lids which keeps lens in place
61
What are some advantages for double thin zones?
Lens remains thin overall | Good edge comfort with thin edges.
62
What are some disadvantages for dynamic stabilization?
Careful SLE is needed.
63
What is periballasting?
Sim to prism ballasting but w/o the prism on the visual axis. Only the peripheral portion of lens resemble a prim. It is thinner compared to prism ballasting
64
When to use back surface toric SCL?
For toric cornea pt
65
When to use Front surface toric SCL?
For lenticular astigmatism pt
66
When is larger OAD a good stabilizing technique?
When it is used with one of th eother stabilizing techniques
67
What do u need to input into SCOR?
manifest rx trial lens rx The spherical cyl over refraction
68
Describe accommodation for a myope wearing CLs
Accommodative demand is greater for a CLs wearing myope than for a spectacle wearing myope
69
Describe Knapp's Law
Anisometropic axial refractive error should not be corrected w/ CLs
70
T/F? | Sagittal depth is proportional to diameter and inversely related to radius.
True
71
What does the prefit CLs exam consist of?
CLs related case hx Review primary care exam findings Measure anatomical parameters relevant to CLs wear
72
How does a CLs improve the vision for a myope?
Increases retinal image size
73
How does a CLs improve the vision for a hyperope and amblyope
Decreases aberrations and prismatic effects
74
Tell me the relationship b/w hydrogel lenses and chemicals?
Hydrogel lenses soak up the fumes. That is why I struggled when I cleaned broom that day. Had to toss out that pair of contacts
75
In the final consultation, what is the most imp thing?
Evaluate patient's motivation
76
What is the normal value for blink rate?
10-15 blinks per minute
77
Limbal neo of what value is unacceptable for CLs pts?
Greater than or equal to 2mm is contraindicated for CLs usage.
78
Talk about NaFl
Doesn't penetrate intact epithelial cells. | Fills intercellular spaces when cell junctions are disrupted and stains damaged epithelial cells
79
Name some methods for NITBUT
Keratometry | Top of placido mires
80
Describe staining for rose bengal
Stains dead or devitalized cells. | Lissamine is better bcaz less irritating and more sensitive.
81
Which testing measures tear quantity?
Shirmer I, II | Phenol Red thread
82
What test measures quantity and quality of tears?
Tear miniscus
83
What is an abnormal value for phenol red thread?
Less than or equal to 10mm/15 secs | Less evasive and no anesthetic is required compared to schirmers
84
When is tangential topography beneficial?
When there is pathology going on. Keratoconus. It gives smaller and precise patterns and locations
85
What is axial topography good for?
Fitting SCL. Simple way to describe the overall shape of the cornea.

CLs (3 decks)

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