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Flashcards in Final Deck (119)
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1

What is the GP fitting method in which you order the patient's first lens based on measurements alone?

empirical

2

What is the GP fitting method in which you have the patient try on trial lenses to determine the best fit then order in appropriate power?

diagnostic

3

What are the main categories of things to evaluate with GP lens fitting?

 Centration
 Lid Attached or IP*
 Central fluorescein pattern*
 Peripheral fluorescein pattern*
 Power (Over-refraction)

4

When should an over refraction be vertexed?

if exceeds +/-4.00

5

What is the GP wear schedule in which the lens is worn when awake only?

daily wear

6

What is the GP wear schedule in which the lens is worn for up to 6+ consecutive days and nights before overnight removal?

extended wear

7

What is the GP wear schedule in which the lens is worn for up to 20+ consecutive days and nights before overnight removal?

continuous wear

8

What is the neophyte follow up schedule for GP daily wear?

 Baseline (fitting) examination
 Dispensing (3-10 days)
 1-2 week follow-up
 1-3 month follow-up
 6 month follow-up visit (as needed)
 Yearly examination (& re-fitting)

9

What is the neophyte follow up schedule for GP extended/continuous wear?

 Monitor more closely…
 Day 1 (must be am visit)
 1-2 week
 1-3 months
 6 months
 Yearly exam

10

What is the veteran follow up schedule for GP daily wear?

 Dispensing (3-10 days)
 1-2 week follow-up
 3-6 month follow-up (as needed)
 Yearly exam (& re-fitting)

11

What are some things that you should definitely avoid while wearing GP CLs?

1. swimming and showering
2. cosmetics that aren't oilfree

12

What class of medical devices are CL's?

class 2

13

What should be told to neophyte GP CL wears about adaptive signs and symptoms?

1. expected during first few days to weeks
2. diminishes with each day
3. discomfort
4. tearing, FB sensation
5. increased blinking
6. intermittent blurry vision
7. redness
8. light sensitivity

14

What is the tear fluid that is trapped between a GP lens and the front surface of the cornea called?

lacrimal lens

15

What is the equation to find the lacrimal lens value in an empirical fit? 1. Contact lens power in empirical fit? 2

1. LL = BCR - Ks
2. CLP = SpecRx - LL

16

What is the astigmatism that remains after placing the GP CL on the eye? 1. What are the two type? 2

1. residual astigmatism
2. regular and irregular

17

What is the equation for the predicted GP residual astigmatism?

Predicted = Total ocular astig - corneal astig = spectacle cyl - corneal cyl

18

What neutralizes corneal astigmatism in GP lenses?

lacrimal lens

19

What are the formaulae used for the optical cross calculation?

1. LL = BCR - Ks
2. SpecRx = LL + CLP + Residual astig (or over refraction)

20

For the have versus need evaluation of GP lenses what is the need? 1. The have? 2. What does it find? 3

1. spectacle cylinder measured by refraction
2. corneal cylinder corrected by lacrimal lens
3. residual astigmatism

21

Using the have versus need method, if the spectacle cylinder is the same axis as the corneal cylinder and greater in magnitude, will the patient need (more or less) than they have? 1. Will they be over or under corrected? 2. Will the RA axis be the same or off? 3

1. more
2. under
3. same

22

Using the have versus need method, if the spectacle cylinder is the same axis as the corneal cylinder and lesser in magnitude, will the patient need (more or less) than they have? 1. Will they be over or under corrected? 2. Will the RA axis be the same or off? 3

1. less
2. over
3. 90deg away from spectacle axis

23

For a WTR cornea, if the spectacle cylinder is WTR and equal to the corneal cylinder, what's the RA? 1. If the spectacle cylinder is WTR and greater than the corneal cylinder? 2. If the spectacle cylinder is WTR and less than the corneal cylinder? 3

1. 0
2. WTR
3. ATR

24

For a ATR cornea, if the spectacle cylinder is ATR and equal to the corneal cylinder, what's the RA? 1. If the spectacle cylinder is ATR and greater than the corneal cylinder? 2. If the spectacle cylinder is ATR and less than the corneal cylinder? 3

1. 0
2. ATR
3. WTR

25

What are the deposition issues involved in contacts?

1. protein deposits
2. lipid deposits
3. surface damage
4. caliculi, jelly bumps

26

With a non contact lens wearer, are the bacterial infections mostly gram positive or negative? 1. CL wearer? 2

1. gram +
2. gram -

27

What are the four major functions of CL solutions?

1. disinfect/clean (preservatives kill and inhibit)
2. enhance surface wetability (optics and comfort)
3. keep lens hydrated
4. mechanical buffer between lens and cornea

28

What are the types of disinfection substances in CL solutions?

1. Benzalkonium Chloride (BAK)
2. Chlorhexidine (limited yeast/fungi, only GP)
3. Ethylenediamine Tetraacetate (EDTA)
4. Ployaminopropyl Biguanide (PAPB)
5. Polyquaternium-1
6. Benzyl Alcohol
7. Hydrogen Peroxide

29

What are the different levels of efficacy of disinfectants (and whether it is bactericidal or bacteriostatic)?

1. sterilization (bactericidal)
2. disinfection (bactericidal and bacteriostatic)
3. preservation (bacteriostatic)

30

What is the exposure time to kill 90% of an organism called?

D value