CL 1

Question 1

Corneal shape is

Answer 1

Elliptical

Question 2

HVID is at

Answer 2

11.7 mm

Question 3

VVID is at

Answer 3

10.6 mm

Question 4

Corneal curvature flattens toward the

Answer 4

Periphery

Question 5

T/F
The cornea is a meniscus lens

Answer 5

T

Question 6

Layers of the cornea

Answer 6

Anterior epithelium
Bowmans membrane
Corneal stroma
Descemets membrane
Endothelium

Question 7

The cornea is composed of

Answer 7

78% water
15% collagen
5% other proteins
1% glycosaminoglycans
1% salts

Question 8

Regular and smooth layer of the cornea

Answer 8

Epithelium

Question 9

The epithelium consists of 3 types of cells:

Answer 9

Squamous cell
Wing cell
Columnar or basal cell

Question 10

Acellular
Mainly collagen layer of the cornea

Answer 10

Bowman’s layer

Question 11

It comprises 90% of the corneal thickness, mostly collagenous lamellae

Answer 11

Stroma

Question 12

Contains 2-3% keratocytes and 1% GAGs

Answer 12

Stroma

Question 13

Thickness of descemets membrane

Answer 13

10-12 microns thick

Question 14

Slightly elastic and structureless layer of the cornea

Answer 14

Descemet’s membrane

Question 15

Secreted by the endothelium

Answer 15

Descemets membrane

Question 16

Single layer composed of approx 5k polygonal cell

Answer 16

Endothelium

Question 17

18-20 microns thick

Answer 17

Endothelium

Question 18

One of the richest sensory nerve supplies in the body

Answer 18

Cornea

Question 19

What is a soft contact lens?

Answer 19

A thin, flexible lens typically made of hydrogel that conforms the shape of your eye

Question 20

What is RGP?

Answer 20

Are rigid lenses that allows oxygen to pass through the materials.

Question 21

Advantage of soft CL

Answer 21

Comfortable fit
Suitable for various EOR
Period of adjustment is quick

Question 22

Advantage of RGP

Answer 22

Provides clear and sharp vision
More resistant to deposits and damage
Less prone to dehydration

Question 23

Purpose of TBUT

Answer 23

Measures the tear quantity

Question 24

Purpose of Schirmer’s test

Answer 24

Measures the tear quality

Question 25

How to properly put on contact lenses

Answer 25

Wash your hands Clean the contact lens Hold the CL right-side out on the tip of finger Hold your eye open Place the contacts in your eye Make sure the lenses feel comfy

Question 26

OAD

Question 27

TD

Answer 27

total diameter

Question 28

OZD

Answer 28

optic zone diameter

Question 29

BOZD

Question 30

CCC

Answer 30

Central corneal clouding

Question 31

ATR

Answer 31

AGAINST THE RULEE

Question 32

WTR

Answer 32

WITH THE RULE

Question 33

Dk

Answer 33

Oxygen permeability

Question 34

PMMA

Answer 34

PolyMethyl MethAcrylate

Question 35

NIBUT

Answer 35

Non invasive break up time

Question 36

GAG

Answer 36

GLYCOSAMINOGLYCANS

Question 37

GPC

Answer 37

giant papillary conjunctivitis

Question 38

HVID

Answer 38

HORIZONTAL VISIBLE IRIS DIAMETER

Question 39

TBUT

Answer 39

TEAR BREAK UP TIME

Question 40

SiHy