Contact Lens Equipment and Measurements : Corneal Topography / Dry Eye

Question 1

What maps the corneal curvature and elevation?

Answer 1

Corneal Topography

Question 2

What are the purposes of corneal topography?

Answer 2

Monitor Corneal Changes
Fit contact lenses based on curvature
Pre and post refractive surgery

Question 3

What colors are steeper curvature?

Answer 3

Red / Warm

Question 4

What colors are flatter curvature?

Answer 4

Green / Cooler

Question 5

What are the types of maps?

Answer 5

Axial
Tangential
Elevation
Corneal Thickness

Question 6

What type of map :

• Corneal power
• Good overview

Answer 6

Axial

Question 7

What type of map :

• Power and curvature at individual points
• Most accurate

Answer 7

Tangential

Question 8

What calculates elevation?

Answer 8

Placedo disc

Question 9

What : actual elevation measured

Answer 9

Scheimpflug

Question 10

What type of test asses and evaluate lipid layer?

Answer 10

Tear Break Up Time

Question 11

What type of schirmer test is with no anesthetic?

Basal and Reflex

Answer 11

Test 1

Question 12

What type of schrimer test is with anesthetic?

Basal

Answer 12

Test 2

Question 13

What is scale is the same for every topography map?

Answer 13

Absolute

Question 14

What scale emphasizes?

Answer 14

Normalized

Question 15

What measures ant and post surface of cornea?

Answer 15

Sheimpflug

Question 16

What measures thickness of the cornea?

Answer 16

Pachymetry

Question 17

What dye is used for TBUT?

Answer 17

Fluorescein

Question 18

What is the biggest layer of the tear film?

Answer 18

Aqueous

Question 19

What is the tear film?

Answer 19

Lipid
Aqueous
Mucus

Question 20

What type of assessment is putting a filter paper in th eye?

Answer 20

Schirmer Test

Question 21

What type of assessment is putting thread in the eye?

Answer 21

Phenol Red Test