unit 4

Question 1

Physiological considerations for lens selection

Answer 1

-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

Question 2

Considerations for HVID

Answer 2

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

Question 3

Considerations for recurrent corneal erosion

Answer 3

-Must heal before fitting
-Possible therapeutic bandage lens

Question 4

Considerations for poor tear layer stability

Answer 4

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

Question 5

Considerations for corneal scarring

Answer 5

Good candidate for GP or hybrid

Question 6

Considerations for corneal disease (kerataconus)

Answer 6

good cadidate for GP or hybrid

Question 7

Considerations for lid margins

Answer 7

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

Question 8

Consideration for GPC

Answer 8

Treat prior to fitting

Question 9

Consideration for vertical palpebral aperture

Answer 9

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

Question 10

Considerations for pupil sizw

Answer 10

Can affect MF contact lens, GP lens BOZD

Question 11

Consideration for corneal shape (prolate vs oblate ; eccentricity)

Answer 11

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

Question 12

Considerations of high ametropia

Answer 12

High plus
High minus
High cylinder

Question 13

Considerations for handling problems

Answer 13

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

Question 14

Ocular medication considerations

Answer 14

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

Question 15

Systemic meds associate w/ dry eye considerations

Answer 15

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

Question 16

Side effects of Rifampin therapy

Answer 16

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

Question 17

Ocular health considerations

Answer 17

-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

Question 18

Types of tinted lenses

Answer 18

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

Question 19

Sports lens considerations

Answer 19

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

Question 20

Types of overnight extended wear

Answer 20

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

Question 21

Extended wear complications

Answer 21

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

Question 22

What is hypoxia

Answer 22

lack of oxygen

Question 23

What is corneal edema

Answer 23

Swelling of cornea

Question 24

types of inflammation from extended wear

Answer 24

Corneal infiltrative events
Giant pupillary conjunctivitis
Contact lens acute red eye

Question 25

what does Lavendar tint CL do

Answer 25

Migraine/headache relief
Reduces eye strain
Photophobia (especially in fluroescent and outdoor lights)

Question 26

Red tint purpose

Answer 26

migraine relief
reduces glare
improves contrast
enhances perception

Question 27

purpose of cobalt blue tint

Answer 27

reduces glare
may help reduce seizures related to photosensitive epilepsy