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Contact Lens Theory > Quiz Questions Week 1 -5 > Flashcards

Quiz Questions Week 1 -5 Flashcards

1
Q

During a routine contact lens exam, you notice the patient has a Dellen. What would be one cause?

A

GP lens rubbing on the limbus

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2
Q

During a contact lens evaluation, it is observed that the patient has superficial punctate staining. What is one cause?

A

Improper use of hydrogen peroxide solution

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3
Q

The patient presents with the inward turning of the eye. Name one specific cause.

A

Trauma to the eyelid

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4
Q

During thr contact lens examination, the optician notices staining at the inferior 6’oclock position. What is one specific cause for this staining?

A

Incomplete blink meaning the tear film is not spreading over the cornea properly.

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5
Q

What is one cause of ancanthameba?

A

swimming/showering in contact lenses

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6
Q

During a slit-lamp examination, it is observed that this patient has corneal edema. What is one cause?

A

Overwear like sleeping in cls that causes hypoxia

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7
Q

What is one CAUSE of dry eye?

A

aqueous deficiency?

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8
Q

What is one SIGN of dry eye observed by the practioner?

A

3 o’clock and 9 o’clock staining

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9
Q

A tear prism of 3mm or higher could be indicative of……….

A

Plugged punctum

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10
Q

Corneal Hypoxia is……………..

A

Oxygen deprivation of the cornea

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11
Q

Reduced sensitivity of the cornea could be the first sign of…………..

A

Hypoxia

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12
Q

What is meant by DK value?

A

Oxygen permeability

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13
Q

What is the medical term for ‘bulging eyes’ due to thyroids?

A

Exophthalmos

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14
Q

Another term for ‘excessive tearing’ is……….

A

Epiphora

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15
Q

If a patient presents with contact lens overwear one of the symptoms observed in a slit lamp will be………..

A

Corneal Vascularization

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16
Q

If a patient presents with entropian it means ……….

A

Eyelids are turning inwards

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17
Q

Sclerotic scatter is used to look for…………….

A

Edema

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18
Q

What is the first assessment done during a contact lens fitting?

A

Visual Acuity

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19
Q

Which slit lamp illumination requires the beam to be in the shape of a small circle?

A

Conical Beam

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20
Q

Using disposable contact lenses more than one time falls under the compliance category. T/F

A

TRUE

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21
Q

………………. slit lamp illumination is used to look at the tear film.

A

Specular Reflection

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22
Q

Which one of the following options is NOT a treatment for dry eyes?
1- Blinking exercises
2 - Fluorescein installation
3 - Warm Compresses
4 - Artifical tears

A

2 - Fluorescein Installation

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23
Q

Which slit lamp illuminations detects aqueous flare?

A

Conical Beam

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24
Q

What equipment is used to measure the curvature of the corneal apex?

A

Keratometer

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25
Q

A contact lens fitter gives brochures to the client to store their contact lenses. What component of SOAP is this?

A

Plan

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26
Q

A contact lens fitter determines the contact lens has good movement. What component of soap is this?

A

Assessment

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27
Q

When you are collecting information on the types of medication that the client is taking this would be considered a/an ……………….

A

Subjective assessment

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28
Q

When you perform a keratometry assessment on a patient this type of assessment would be considered a/an …………..

A

Objective assessment

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29
Q

When taking k readings you get the following prescription: OD:45.50/47.00@090. Is this WTR or ATR?

A

WTR

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30
Q

The keratometer reading is Clear Blurry Clear, what type of fit does this indicate?

A

Flat fit

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31
Q

Which one of the following reasons is not an important part of the preliminary assessment when assessing tears during contact lens fitting?
1 -Predict potential success of a client
2 -Eliminate likely failures
3 -Discover marginally dry eyes which would be adversly affected by contact lenses
4 -Ensure these is no GPC

A

4 -Ensure these is no GPC

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32
Q

When a patient reports symptoms, they generally fall into three broad categories? What are they?

A

Appearance of the eye
Ocular Discomfort
Poor Visual acuity

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33
Q

Name 3 indirect illuminations

A

Retro illumination
Indirect Proximal illumination
Sclerotic scatter

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34
Q

If a patient is told to throw away there lens every 14 days. This is known as………

A

Modailty - a way to use them

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35
Q

…………………(soft
cl material) lenses are generally the number one lens of choice.

A

silicone hydrogel

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36
Q

Which of the following is NOT a contact lens recommendation for high prescriptions?
1- silicone hydrogel
2- large diameter
3- high oxygen permeability
4-low water content hydrogel

A

4 - low water content hydrogel lenses

37
Q

Axial myopia occurs when……

A

the eyeball is too long

38
Q

Spherical equivalent lenses should only be used in place of a toric lens when the astigmatism is less than ………… dioptres.

A

-0.75D

39
Q

How are hard lenses manufactured?

A

Lathe cutting

40
Q

Prism ballast lenses work on a stabilization technique that ………… the bottom of the lens.

A

weights

41
Q

Extended wear lenses can be worn up to how many nights in a row before removing them?

A

6 nights

42
Q

Surface wettability can be assessed with a ……………..

A

keratometer

43
Q

To check the back vertex power of a lens it is done with a ………..

A

lensometer

44
Q

What is the most common manufacturing process of soft contact lenses?

A

cast molding (injection molding)

45
Q

When checking the fit of a toric lens you notice the lens is rotated 20 degrees clockwise. The orginal trial was -1.00 -1.25 x 100. What would the new lens power be?

A

-1.25 -1.00 x 120

46
Q

Lenses that are occassionally slept in overnight can be classified as……………

A

flexible wear

47
Q

Soft contact that start as a rod or button of material are manufactured using the ………… process.

A

Lathe cut

48
Q

What is the stabilization design called when a lens is sliced flat at the bottom?

A

truncation

49
Q

Which lens stabilization design uses a minus carrier lens?

A

peri ballast

50
Q

This lens may appear well-fitted and comfortable initially but after several hours of wear there may be discomfort. The lens may also have minimal movement. What should the contact lens fitter do?

A

flatten the base curve as the lens is too tight/steep

51
Q

Silicone hydorgel are more rigid than hydrogels and therefore are easier to handle. T/F

A

TRUE

52
Q

Hydrogel lenses have higher oxygen permeability then silicone lenses. T/F

A

FALSE

53
Q

Hydrogel lenses are hydrophobic. T/F

A

FALSE

54
Q

When a toric lens is rotated to the right you would add the degree of rotation to the current axis to compensate. T/F

A

FALSE - the marking is to the right so counter clockwise - LARS - RIGHT SUBTRACT

55
Q

A dry eye patient would benefit from HEMA hydrogels lens with a high water content. T/F

A

FALSE

56
Q

Environmental and task factors can affect lens dehydration. T/F

A

TRUE

57
Q

Thin lenses are less prone to dehydration and easier to handle for minor degrees of myopia. T/F

A

FALSE

58
Q

What are two things that can be done to improve a loose fitting lens?

A

-Keep the BC the same and choose a larger diameter
-Keep the diameter the same and steepen the BC

59
Q

When assessing a soft contact lens in relation to lens movement, what are the 4 checks that a CLF should perform?

A

Upward gaze
lateral gaze
push up test
Blinking

60
Q

Which equipment is used to measure the diameter of a gp lens?

A

a V-gauge

61
Q

Which equipment is used to measure the BC of the lens?

A

Radiuscope

62
Q

What is the disadvantage of using PMMA lenses?

A

oxygen permeability

63
Q

If a gas permeable lens is too thin the following can occur…………..

A

lens flexure

64
Q

Adhesion to the cornea in a rgp indicates what probably cause?

A

steep fit

65
Q

A person wearing a RGP lens complains of the following symptoms, loss of vision nd comfort. What is one probably cause?

A

scratches on lens

66
Q

Which measurement affects the lens to cornea fitting relationship?

A

BC - base curve

67
Q

A slit lamp can be used to assess the edge of the gp lens. T/F

A

TRUE

68
Q

You are given the following K’s: 43.50/44.50 @ 090 and asked to fit the k meridian at 43.25. What would you do to the lens?

A

add plus power

69
Q

Needing a lower DK lens is a good reason to switch to a gas permeable lens. T/F

A

FALSE

70
Q

The following statement that the back lens power increases by +0.25 for each 0.05mm that the BOZR is steeper than the cornea. The over-refraction will therefore need to be -0..25D greater. T/F

A

TRUE - understand the logic reread

71
Q

What is the purpose of preservatives in cls solution?

A

restricts growth of microorganisms

72
Q

Alcohols, such as isopropyl may be incorporated as a preservative in cleaning solutions. Is this statement true?

A

YES

73
Q

What agent improves the wetting time and comfort of the solution?

A

viscosity agent

74
Q

What is preservative free saline used for? 2

A

-mainly for rinsing
-heat disinfection

75
Q

Fitting scleral lenses decreases mucus build up. T/F

A

FALSE -mucus accumulates especially at the start

75
Q

A therapeutic tinted lens is designed to…….

A

treat an underlying defect or disease

75
Q

What is a purpose of a prophylactic tint?

A

prevent injury or disease of the eye

76
Q

Another name for a comfort drop is dual surfactant. T/F

A

FALSE

76
Q

Acanthamoeba is a …………………

A

type of bacteria that can cause vision loss

77
Q

What is the primary indication of scleral lenses?
1- keratoconus
2 - vascularization
3 - children
4 - seniors with prebyopia

A

1-Keratoconus

78
Q

What is the purpose of fenestration?

A

to help with tear exchange

79
Q

A coloured lens can alter surface chemistry of a lens which can …………

A

reduce wettability

80
Q

What is the main factor that causes corneal swelling when wearing a lens overnight is……………

A

hypoxia

81
Q

In you children cls can be useful to manage different ocular motility disorders such as nystagmus. T/F

A

TRUE

82
Q

Silicon rubber lenses are used in correction of refractive error in…………

A

young children

83
Q

When a person has reoccurring corneal erosion. They may be fitted with…….

A

bandage lens

84
Q

What 2 methods can be used for disinfections?

A

heat
chemical

85
Q

What are two changes that have known to occur on the cornea with EW lenses?

A

epithelian cell changes - dry eye
hypoxia due to restricted amount of oxygen to the cornea - vascularization/edema

Contact Lens Theory (27 decks)

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