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Contact Lens Theory > Week 5 - Quiz Revision > Flashcards

Week 5 - Quiz Revision Flashcards

1
Q

What is the primary purpose of handling tints in contact lenses?

A

to make lenses easier to locate during handling

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2
Q

Cosmetic tinted lenses are primarily used for………

A

enhancing or changing the eye’s colour

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3
Q

Which type of tinted lens is used to mask corneal scarring or to make a disfigured eye appear more typical?

A

prosthetic tint

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4
Q

Performance-enhanced tinted lenses, such as X-chrome lenses, are used to…….

A

enhance color vision in color-deficient patients

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5
Q

Who would be an ideal candidate for prophylactic tinted lenses?

A

patients exposed to intense sunlight/UV

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6
Q

Which type of tinted lens is often hand-painted for custom theatrical effects?

A

theatrical tint

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7
Q

Therapeutic tinted lenses are primarily designed to……….

A

treat underlying defects or diseases

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8
Q

Which condition could benefit from therapeutic tinted lenses to reduce photophobia?

A

achromatopsia

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9
Q

What is a key characteristic of prosthetic tinted lenses for non - sighted eyes?

A

they have a painted iris and opaque pupil

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10
Q

A tinted contact lens can improve vision in low light conditions. T/F

A

FALSE

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11
Q

What condition is associated with reduced oxygen supply to the cornea in extended wear cls?

A

Corneal Hypoxia

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12
Q

What symptom should patients monitor for as an early sign of potential cl complications?

A

sensitivity to light

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13
Q

How is flexible wear best described?

A

intermittent use of cls overnight and during sleep

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14
Q

What is the primary advantage of frequent replacement lenses in extended wear?

A

reduced exposure to accmulated protein deposits

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15
Q

Which adverse effect is specifically associated with the use of higher modulus, first-generation silicone hydrogel lenses in extended wear?

A

unwanted orthokeratology

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16
Q

What is a common ocular response when a patient first wears RGPs lenses?

A

narrowing of the palpebral aperture

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17
Q

What is the preferred type of lens for patients with severe drye eyes?

A

scleral lenses

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18
Q

Which condition is a medical indication for cl usage?

A

keratoconus

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19
Q

What are two common contraindication for cl wear?

A

poor hygiene and compliance

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20
Q

What should a px do if they experience difficulty removing their cls after showering?

A

use artificial tears and keep the eyes closed for one minute before trying again

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21
Q

If a px presents with bilateral superficial punctate keratitis (SPK) and mild irritation at their one - month follow up, what is the most likely cause?

A

solution sensitivity

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22
Q

What type of cl is often best for correcting corneal irregularities?

A

RGP lenses

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23
Q

Which of the following is NOT a recommended action for a patient experiencing non-wetting of a rigid lens?

1-increase the lens replacement frequency
2- polish the lens to remove deposits
3- use protein-removing agents
4-stop wearing cls permanently

A

4- stop wearing cls permanently

24
Q

Which environmental condition might contraindicate cl use?

A

working in a lab with chemical fumes

25
Q

What is the primary function of a scleral lens?

A

To create a tear-filled vault over the cornea

26
Q

What materials are commonly used for scleral lenses to ensure high oxygen permeability? 2

A

Acuity 200
Boston X02

27
Q

What cl is designed to deliver medication directly to the eye’s surface?

A

Medicated lenses

28
Q

In fitting of multifocal cls which factor is crucial for successful adaptaion?

A

pupil size

29
Q

What is a primary consideration when using distance powered cls with reading glasses for presbyopia?

A

they should be used intermittently rather than continously

30
Q

What should be checked to ensure a well-fitting scleral lens? 2

A

movement and rotation of the lens

31
Q

What is a popular substance found in preservatives?

A

isopropyl (alochol)

32
Q

What does isopropyl do to a cls?

A

dry out the cls

33
Q

Preservative free saline is the best option for lens storage overnight. T/F

A

FALSE

34
Q

The purpose of therapeutic lens is to help normalize an abnormal appearance of the eye. T/F

A

FALSE

35
Q

Therapeutic lenses can help with recurring erosion of the cornea. T/F

A

TRUE

36
Q

Silicon rubber lenses are used to treat and correct for keratoconus. T/F

A

FALSE

37
Q

What is the purpose of sequestering agents?

A

remove protein of a contact lens

38
Q

Dyslexia can be fixed by therapeutic application of a prophylactic tint. T/F

A

FALSE

39
Q

SPK is a sign of solution toxicity?

A

YES

40
Q

Hydrogen peroxide must be neutralized before the cls is clean and ready for use. T/F

A

TRUE

41
Q

What are the 2 methods used for disinfection of a contact lens?

A

Heat
Chemical (cold)

42
Q

Which lens wearing modalitys are most likely to cause hypoxia? 3

A

Extended wear
continous wear
lenses that are slept in

43
Q

A coloured lens can alter surface chemistry of the lens causing the lens to be more dry. T/F

A

TRUE

44
Q

A contact lens can be used to correct vision in patients with nystagmus. T/F

A

TRUE

45
Q

What is the name of the tinted lens designed to enhance performance by enhancing contrast for athletes?

A

Performance enhancing tinted lens (X Chrom)

46
Q

What is fenstration?

A

Hole drilled in lens

47
Q

What agents in solution restricts growth of microorganisms?

A

preservatives

48
Q

What is the purpose of a prophylactic lenses?

A

prevent injury or disease of the eye

49
Q

What does the viscosity agent in solutions do?

A

improves the wetting time and comfort of the solution

50
Q

What type of lens show be used for someone suffering with recurrent corneal erosions?

A

Bandage lens

51
Q

What does ‘three point touch’ refer to?

A

Touch at the corneal apex with lens bearing pressure residing on the peripheral cornea

52
Q

Acanthamoeba is a preservative found in solutions. T/F

A

FALSE

53
Q

What condition can be caused by a steep fitting scleral lens?

A

Blanching

54
Q

A contact lens wearer who reacts to preservatives will benefit from using the hydrogen peroxide system. T/F

A

TRUE

55
Q

Prosthetic tinted lenses is used to change the eye color for cosmetic purposes or for fun. T/F

A

FALSE

56
Q

A nevus can be caused by a toxic reaction to hydrogen peroxide solution. T/F

A

FALSE

57
Q

Wearing EW lens can cause the epithelial cells to change. T/F

A

TRUE

Contact Lens Theory (27 decks)

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