Extra

Question 1

The cornea is approximately ___ mm thick at the periphery and ____ mm thick at the center.

Answer 1

1 mm / .5mm

Question 2

capillaries at the limbus.
The tear film.
The aqueous humor.

Answer 2

The cornea is nourished by three sources.

Question 3

What are the three types of cells present in the epithelium?

Answer 3

1. Squamous 2. Wing cells 3. Basal cells

Question 4

The lipid layer is secreted by ____ and ____ glands.

Answer 4

Meibomian / Zeis

Question 5

Which layer is responsible for tear film stability?

Answer 5

Mucoid layer, (the mucous from the goblet cells which makes the cornea wettable by providing a surface over which tears spread easily.)

Question 6

The first company to make contact lenses of PMMA in the U.S. was _______.

Answer 6

Syntex

Question 7

Retro-illumination is especially useful for studying

Answer 7

Deposits on posterior surface of cornea
Corneal vascularization
Corneal edema
Corneal scars
(Learn different types of illumination and how they are used.)

Question 8

Prism ballast down is added to a lens to keep it from rotating. The weight always makes the base go down to … degrees.

Answer 8

90

Question 9

The greatest chance of edema of any contact lens material is

Answer 9

PMMA

Question 10

If the patient’s K readings are borderline on the choices of the manufacturer always select the steepest or flattest curve?

Answer 10

Fit flatter, you want the lens to be loose.

Question 11

Incomplete eyelid closure is

Answer 11

lagophthalmos

Question 12

Inward turning of the eyelashes

Answer 12

trichiasis

Question 13

A contact lens that gets lost in the eye will be contained to the anterior portion by the

Answer 13

fornix

Question 14

The irritation of the conjunctiva causing dilation of the tiny blood vessels is called

Answer 14

Hyperemia

Question 15

A viral infection causing severe scarring of the lids, eventually affecting the cornea and more prevalent in third world countries is

Answer 15

trachoma

Question 16

Microscopic finger-like projections under the surface of the cornea which gives the mucoid layer something to hold on to, keeping the tear film stable.

Answer 16

microvilli

Question 17

The tear reservoir collected along the top and bottom lid margins is referred to as the ____.

Answer 17

tear meniscus

Question 18

Observation of wrinkles or folds in the choroid or cornea is ______ and caused by ______.

Answer 18

Striae / a cornea that doesn’t get enough oxygen, edema, is correctable

Question 19

(Conventional Wear) is worn during waking hours. 12-13 hours. Replace
every 12 months

Answer 19

Daily Wear

Question 20

may be worn during sleep usually up to 7 days. FDA regulations
state 14 days and new silicone hydrogel lenses are approved for 30 days

Answer 20

Extended Wear

Question 21

can be worn as both a daily wear and extended wear lens

Answer 21

Flexible Wear

Question 22

These lenses can be slept with and used as a Daily wear lens

Answer 22

Disposables

Question 23

are discarded after one day of use every day. Usually comes in
90- and 30-day supplies packs

Answer 23

Disposable “Dailies”

Question 24

lens should move .5 mm- 1 mm with the blink

Answer 24

Primary Gaze

Question 25

lens should drop .5 mm - 1 mm

Answer 25

Upward Gaze

Question 26

1mm - 2 mm

Answer 26

Ideal Movement