unit 4 Flashcards

1
Q

Physiological considerations for lens selection

A

-HVID
-Recurrent corneal erosino
-Poor tear layer stability
-Corneal scarring
-Corneal disease
-Lid margins
- GPC
-Vertical palpebral aperture
-Pupil size
-Corneal shape
-High ametropia
-Lenticular vs corneal astigmatism
-Systemic disease
-Handling problems

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2
Q

Considerations for HVID

A

Large or small cornea = may require custom soft lens
-GP lens must be smaller than HVID

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3
Q

Considerations for recurrent corneal erosion

A

-Must heal before fitting
-Possible therapeutic bandage lens

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4
Q

Considerations for poor tear layer stability

A

-Dry eye can benefit from scleras
-Dry eye could be good GP candidate (mild and borderline)

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5
Q

Considerations for corneal scarring

A

Good candidate for GP or hybrid

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6
Q

Considerations for corneal disease (kerataconus)

A

good cadidate for GP or hybrid

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7
Q

Considerations for lid margins

A

Treat prior to fitting
consider if their lid margin is small or large

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8
Q

Consideration for GPC

A

Treat prior to fitting

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9
Q

Consideration for vertical palpebral aperture

A

May impact size of lens of lens design (hybrid may be difficult to insert with small VPA)

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10
Q

Considerations for pupil sizw

A

Can affect MF contact lens, GP lens BOZD

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11
Q

Consideration for corneal shape (prolate vs oblate ; eccentricity)

A

-Oblate needs reverse geometry GP lens
-Eccentricity will affect sagittal depth

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12
Q

Considerations of high ametropia

A

High plus
High minus
High cylinder

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13
Q

Considerations for handling problems

A

a px with arthritis would not be good to wear CLs because they may struggle inserting and removing CLs or cleaning the CLs

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14
Q

Ocular medication considerations

A

Usually wait 10-15 mins after instilling drops before inserting soft contact lenses (always read medications instructions)

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15
Q

Systemic meds associate w/ dry eye considerations

A

Antihistamines, decongestants, blood pressure, tranquilizers, parkinsons meds, antidepressants, birth control, and horome replacement therpay

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16
Q

Side effects of Rifampin therapy

A

When taken causes contact lenses to discolor to a pink color. This drug is often used to treat tuberculosis

17
Q

Ocular health considerations

A

-Last eye exam and last CL exam
-CL wearing time
-Modality of wear
-Previous CL wear and solutions
-Allergies to solutions
-History of eye disease or infections
-Pregnancy

18
Q

Types of tinted lenses

A

-Handling tint
-Cosmetic tint
-Prosthetic lenses
-Therapeutic tinted lenses
-Performance enhancing tints
-Theatrical lenses

19
Q

Sports lens considerations

A

-Cold
-Wind
-Altitude
-Dusty environment
-Aquatic sports
-Outdoor UV effects

20
Q

Types of overnight extended wear

A

-Overnight wear of soft CL
-Overnight wear of GP CL
-Overnight wear of ortho K lenses

21
Q

Extended wear complications

A

Risk of infection
Corneal ulcer
Inflammation
Superior epithelial arcuate lesions
Corneal edema
Hypoxia

22
Q

What is hypoxia

A

lack of oxygen

23
Q

What is corneal edema

A

Swelling of cornea

24
Q

types of inflammation from extended wear

A

Corneal infiltrative events
Giant pupillary conjunctivitis
Contact lens acute red eye

25
what does Lavendar tint CL do
Migraine/headache relief Reduces eye strain Photophobia (especially in fluroescent and outdoor lights)
26
Red tint purpose
migraine relief reduces glare improves contrast enhances perception
27
purpose of cobalt blue tint
reduces glare may help reduce seizures related to photosensitive epilepsy