Contact Lenses Iii Mt 2 - Presbyopia

Front 1

__% become presbyopic before age 40.

Back 1

5%

Front 2

__% become presbyopic at age 40-42.

Back 2

45%

Front 3

__% become presbyopic at age 42-44.

Back 3

50%

Front 4

__% become presbyopic beyond age 44.

Back 4

1%

Front 5

Over __% of the vision care population are presbyopes.

Back 5

50

Front 6

__% presbyopes are interested in contact lenses.

Back 6

27

Front 7

Name advantages and disadvantages of decrease of elasticity in lid tissue in relation to contact lenses.

Back 7

Adv = decr awareness of RGPs
Disadv = incr difficulty in lens removal, decr lid effect on lenses

Front 8

Tear flow tends to be (incr/decr) with increased age.

Back 8

decreased

Front 9

Corneal sensitivity (incr/decr) with age.

Back 9

decreases

Front 10

T/F - The threshold for touch (cornea) doubles between ages of 10 and 30 and increases rapidly after age 30.

Back 10

False - doubles betw 10 and 80, incr rapidly after age 40.

Front 11

The threshold for corneal touch (incr/decr) with increasing age therefore adaptation to CLs is (easier/harder).

Back 11

incr, easier

Front 12

What are the causes of age-related miosis thought to be?

Back 12

1) Dilator muscle atrophy
2) Incr rigidity of iris blood vessels
3) Combination of the two

Front 13

T/F - The amt of light reaching the retina in a 60-yr old is only 1/3 that reaching the retina of a 20-year old.

Back 13

True - a combined effect of lens and pupil change

Front 14

In the Framingham study, around what age range is the most significant drop of percentage with people 20/10 to 20/25 VAs?

Back 14

75-85 yrs old (69.1%)

Front 15

What were the reasons, in order from most prevalent to least, for the significant drop of VAs in the Framingham study with the 75-85 age group?

Back 15

Cataract (46%)
Macular degeneration (28%)
Glaucoma (7.2%)
Retinal pathology (7%)

Front 16

T/F - One disadvantage of monovision is glare at night.

Back 16

True

Front 17

Your monovision patient has an SRx of -2.00 DS OU, Add +2.50, dominant right eye. What is the expected CLP and OR?

Back 17

CLP:
-2.00 DS OD
+0.50 DS OS

OR:
PL OD
-2.50 DS OS

Front 18

A centrad CL design has the distance portion in the (center/periphery)

Back 18

center

Front 19

A reverse centrad CL design has the near portion in the (center/periphery)

Back 19

center

Front 20

T/F - A diffractive CL design is analgous to a PAL

Back 20

False - an aspheric CL design

Front 21

Traditional aspheric multifocals are typically fitted (flatter/steeper) than avg K.

Back 21

Steeper

Front 22

Hybrid aspheric/translating multifocals are typically fitted (flatter/steeper) than traditional aspherics.

Back 22

Flatter

Front 23

T/F - Traditional aspheric multifocal CLs have add power by alternating asphericity on the back surface.

Back 23

False - traditional = add power with one or two aspheric surfaces

Front 24

T/F - Hybrid aspheric multifocals have add power by alternating asphericity on the front surface.

Back 24

False - on the BACK surface

Front 25

Name two diffractive multifocal CLs.

Back 25

Diffrax
Hydron Echelon

Front 26

T/F - Simultaneous multifocal lenses involve prism stabilization.

Back 26

False - non-prism stabilized

Front 27

T/F - Simultaneous multifocal lenses always has near vision set in the periphery.

Back 27

False - can be either center or periphery

Front 28

T/F - Simultaneous vision lenses has poor intermediate vision, unless an aspheric design is used.

Back 28

True

Front 29

(Large/Small) pupils are the best case scenario for simultaneous vision multifocal CLs.

Back 29

Large - to cover as much optics as possible

Front 30

T/F - Translating vision multifocal CLs involve prism ballasting.

Back 30

True

Front 31

Where is the distance portion of translating vision multifocal CLs?

Back 31

Superior portion of lens, near vision in inferior portion

Front 32

T/F - In translating vision multifocal CLs, the lid must hold the lens in place.

Back 32

True

Front 33

Which of the following are/is NOT a type of translating vision CL?
- Round, centered
- Round, decentered
- Executive
- Downsweep
- Crescent
- Offset lenticular

Back 33

Downsweep is NOT (it is actually upsweep)

Front 34

T/F - Large pupils are best for alternating/translating vision multifocal CLs.

Back 34

False - want average or small pupils

Front 35

The best case scenario for alternating vision multifocal CLs is a (zero/low/high) WTR toricity.

Back 35

low

Front 36

T/F - Good lid tonicity is not critical with translating vision multifocal CLs.

Back 36

False - must have high tone lid at lower limbus

Front 37

T/F - Binocular performance is important when considering bifocal CLs.

Back 37

True