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P3 > CL Reviewer > Flashcards

CL Reviewer Flashcards

1
Q

he pioneered development of continuous wear of soft CL

A

John de Carte

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2
Q

he is considered to be father of RGP

A

Leonardo Seidner

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3
Q

he conceived the concept of throwaway lenses

A

Orlando Battista

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4
Q

first commercially available disposable lens

A

Danalens

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5
Q

he developed the first commercially available disposable lens

A

Michael Bay

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6
Q

first commercially available daily disposable CL

A

Johnson and Johnson

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7
Q

RGP stands for

A

Rigid Gas Permeable

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8
Q

PPMA stands for

A

Polymethyl-Methacrylate

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9
Q

he understood that better vision could be achieved by enlarging the retinal image

A

Rene Descartes

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10
Q

he proved that cornea played no part in the accommodative process

A

Thomas Young

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11
Q

he is considered as father of CL

A

Sir John Herschel

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12
Q

he is the first person to apply therapeutic contact device on the eye

A

William White Cooper

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13
Q

he devised the first CL for keratoconus

A

Eugene Kalt

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14
Q

limitations of keratometry

A
  • Small area measured; periphery & apex not measured
  • Assumes cornea is a spherical surface: accuracy is questionable
  • Irregular topography not described specifically & sometimes undetected
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15
Q

the color that indicates the steepest curve in a corneal videokeratography

A

Red

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16
Q

CL design where in back surface has two curvature all throughout is

A
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17
Q

CL design wherein back surface has two curvature

A
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18
Q

gradual change in curvature from center to periphery of optic zone

A

Aspherical design

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19
Q

Lens-cornea relationship wherein the CL is more curved than the cornea

A
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20
Q

The eccentricity value of the apex of the cornea is roughly

A

0.50

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21
Q

TRUE about Reverse geometry design, EXCEPT:
a. central portion of lens is steeper than periphery
b. for post-surgical “plateu” topographies
c. for myopia reduction

A

A

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22
Q

True about back vertex power exceot
a. same w px refractive error
b. combines w LL to provide total refractive correction
c. determined by diagnostic lens
d. checked emperically using K reading

A

A

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23
Q

true about base curve of SCL except
a. aka Sagittal depth
b. tends to be much steeper than K
c. Same as RGP
d. range is 8.00 to 9.2mm

A

B

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24
Q

true about lens diameter of SCL except
a. larger than RGP
b. creates greater sag
c. increase stability & comfort
d. increase tear exchange

A

D

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25
Q

wearing sched where CL is only worn when px is awake

A

Daily wear

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26
Q

wearing sched wherein CL can be worn 7 days without removal

A

Extended wear

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27
Q

true of Conventional except
a. lens is replaced when there is need for replacement
b. typically 12 months for SCL
c. px receives one pair at a time
d. less lens care required

A

D

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28
Q

true of Frequent Replacement except
a. aka Programmed replacement
b. lens is frequent replaced
c. lens is worn in DW basis only
d. fewer complications

A

C

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29
Q

true of disposable CL except
a. one time use
b. no lens care
c. more convenience
d. less costly

A

D

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30
Q

true of Handling tints except
a. does not aid in lens handling
b. almost all tints have handling tints
c. can be seen more easily
d. not meant to change eye color

A

A

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31
Q

true of Opaque tints, except
a. change irises to diff color
b. may see some iris through clear pupil
c. mask underlying iris color
d. no blur on edge

A

D

32
Q

true of spincasting except
a. oldest form of CL manufacturing
b. very expensive
c. discovered by Witcherle
d. reproducible

A

B

33
Q

FDA grouping of CL with low water content & ionic

A

Group 3

34
Q

FDA grouping with high water content and non-ionic

A

Group 2

35
Q

FDA grouping with low water content and non-ionic

A

Group 1

36
Q

FDA grouping with high water content and ionic

A

Group 2

37
Q

amount of astig brought by refractive surfaces especially cornea is called

A

Residual

38
Q

According to FDA, CL can be classified as low water content if

A

it contains less than 50% water

39
Q

purpose of inversion markers

A

tells if lens is inside-out

40
Q

range of water content in SCL

A

25 to 74%

41
Q

wearing sched wherein lenses are worn 30 days straight

A

Continuous wear

42
Q

SCL worn alternately with eyeglass prescription is called

A

Occasional wear

43
Q

which scenario is the safest

A

D. A CL designed for continuous wear used in daily manner

44
Q

which scenario is the least safe

A

C. A CL designed for daily wear used in continuous manner

45
Q

true about lacrimal lens in RGP except

A

D. using thick lens formula in solving the power

46
Q

true about low water content hydrogel except
a. poor durability handling
b. fewer deposits
c. lower Dk
d. can be made thinner

A

A

47
Q

true about high water content except
a. higher dk
b. used more often for extended wear
c. more deposits
d. can be made thinner

A

D

48
Q

if BC of CL is steeper than K reading in HCL, the power of lacrimal lens will be

A

Plus

49
Q

if BC of CL is flatter than K reading in HCL, the power of lacrimal lens will be

A

Minus

50
Q

if BC of CL is on-k in HCL, the power of lacrimal lens will be

A

Plano

51
Q

the LL in SCL is said to always be

A

Plano

52
Q

if cornea is astigmatic, the power of LL will be

A

Cylindrical

53
Q

the amount of astig manifested with CL on the eyes called

A

Residual astig

54
Q

true about water content except
a. water is bound within hydrophilic polymer matrix to provide flexibility & oxygen permeability
b. amount of water determines material characteristics
c. very important in silicone hydrogels since O2 depends on it

A

NO EXCEPTION

55
Q

advantages of SCL over HCL except
a. better initial comfort
b. easier part time wear
c. more spectacles blur
d. more frequent replacement

A

C

56
Q

advantages of HCL over SCL except
a. sharper VA
b. better deposit resistance
c. greater durability
d. cost is higher

A

D

57
Q

acceptable blink movement in primary gaze

A

0.5 to 2mm

58
Q

for conventional hydrogel CL the grouping which would be best will be

A

Group 2

59
Q

CL modality schedules by optometrist not manufacturer

A
60
Q

CL modality most convenient

A

Daily disposable

61
Q

CL modality that a pair can be used for 12 months

A

Conventional

62
Q

CL modality where a CL can be worn for a month

A

Monthly disposable

63
Q

CL modality that needs the most contact solution would be

A

Conventional

64
Q

Cl modality where confusion will arise in usage of lens

A

Frequent replacement

65
Q

the cheapest CL modality

A

Conventional

66
Q

type of lens where oxygen transmissibility is so high it can be worn for 30 days straight without removal

A

Continuous wear

67
Q

type of lens where lens may be used only when px is awake

A

Daily wear

68
Q

type of sched where px alternates usage of CL & spectacle lens

A

Occasional wear

69
Q

wearing sched suggests lens can be worn 7 days straight

A

Extended wear

70
Q

wearing sched that we encourage to our px no matter what oxygen transmissibility of lens is

A

Daily lens (chatgpt)

71
Q

lens with Dk/t of 23 will be good for

A

Daily wear

72
Q

lens with Dk/t of 50 will be good for

A

Daily wear (chatgpt)

73
Q

lens with Dk/t of 87 will be good for

A

Continuous wear

74
Q

silicone hydrogel lens is the only one allowed for this modality

A

Continuous wear

75
Q

the LL produced when BC radius of Cl is flatter than curvature of cornea

A

Minus

76
Q

primary advantage of SCL over HCL

A
  • clarity of vision
  • comfort
  • ease of wearing
77
Q

a CL with Dk of 58 is prescribed to px, what will be best management for px

A
  • Advise px to do and extended wear only limit to 2 or 3 nights of overnight wear
  • Advise px to just wear the lens when px is awake - chatgpt

P3 (11 decks)

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