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CONTACT LENS > CL 1 > Flashcards

CL 1 Flashcards

1
Q

Corneal shape is

A

Elliptical

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2
Q

HVID is at

A

11.7 mm

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3
Q

VVID is at

A

10.6 mm

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4
Q

Corneal curvature flattens toward the

A

Periphery

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5
Q

T/F
The cornea is a meniscus lens

A

T

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6
Q

Layers of the cornea

A

Anterior epithelium
Bowmans membrane
Corneal stroma
Descemets membrane
Endothelium

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7
Q

The cornea is composed of

A

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

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8
Q

Regular and smooth layer of the cornea

A

Epithelium

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9
Q

The epithelium consists of 3 types of cells:

A

Squamous cell
Wing cell
Columnar or basal cell

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10
Q

Acellular
Mainly collagen layer of the cornea

A

Bowman’s layer

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11
Q

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

A

Stroma

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12
Q

Contains 2-3% keratocytes and 1% GAGs

A

Stroma

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13
Q

Thickness of descemets membrane

A

10-12 microns thick

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14
Q

Slightly elastic and structureless layer of the cornea

A

Descemet’s membrane

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15
Q

Secreted by the endothelium

A

Descemets membrane

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16
Q

Single layer composed of approx 5k polygonal cell

A

Endothelium

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17
Q

18-20 microns thick

A

Endothelium

18
Q

One of the richest sensory nerve supplies in the body

19
Q

What is a soft contact lens?

A

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

20
Q

What is RGP?

A

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

21
Q

Advantage of soft CL

A

Comfortable fit
Suitable for various EOR
Period of adjustment is quick

22
Q

Advantage of RGP

A

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

23
Q

Purpose of TBUT

A

Measures the tear quantity

24
Q

Purpose of Schirmer’s test

A

Measures the tear quality

25
Q

How to properly put on contact lenses

A

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

27
Q

TD

A

total diameter

28
Q

OZD

A

optic zone diameter

30
Q

CCC

A

Central corneal clouding

31
Q

ATR

A

AGAINST THE RULEE

32
Q

WTR

A

WITH THE RULE

33
Q

Dk

A

Oxygen permeability

34
Q

PMMA

A

PolyMethyl MethAcrylate

35
Q

NIBUT

A

Non invasive break up time

36
Q

GAG

A

GLYCOSAMINOGLYCANS

37
Q

GPC

A

giant papillary conjunctivitis

38
Q

HVID

A

HORIZONTAL VISIBLE IRIS DIAMETER

39
Q

TBUT

A

TEAR BREAK UP TIME

CONTACT LENS (2 decks)

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