Gonio 1

Question 1

360 degree circular tube lined by endothelium

Answer 1

Schlemm’s canal

Question 2

SL demarcates the termination of

Answer 2

Descemet’s membrane, denoted by circular deposition of collagen

Question 3

Most anterior structure of the anterior chamber angle and denotes the anterior termination of the TM

Answer 3

Schalbes line

Question 4

Anteriorly displaced and severely hypertrophic SL

Answer 4

Posterior embryotoxon

Question 5

When schwalbe’s line is pigmented

Answer 5

Sampolesis line

Question 6

In some eye there is a prominent thickening or elevation at the site of SL

Answer 6

15%

Question 7

Necessary to establish the type of glaucoma

Answer 7

Gionoscopy
Open vs close angle
Primary vs secondary

Question 8

Gonioscopy can be used for non glaucoma abnormalities

Answer 8

Tumors

Question 9

Delivery of certain glaucoma treatments requires

Answer 9

Visualization of the angle

Question 10

Critical angle for cornea-air interface

Answer 10

46.5 degrees

Question 11

At the critical angle, light exits

Answer 11

Perpendicular to normal

Question 12

When angle of incidence is greater than critical angle, light is reflected back into eye

Answer 12

Total internal reflection

Question 13

The anterior chamber angle is not visible without

Answer 13

A gonioscopy lens bc the critical angle is exceeded

Question 14

Bc the critical angle (46.60 IS EXCEEDED), light from the anterior chamber is

Answer 14

Reflected back into the eye

Question 15

What is the goal of gonio

Answer 15

Overcome the critical angle limitation that prevent direct observation of the anterior chamber angle

Question 16

Direct gonioscopy

Answer 16

Direct observation of the angle , spatial orientation is unchanged

Question 17

Indirect gonioscopy

Answer 17

Angle is observed through a mirror: provide a mirror image image of the apposite angle

Question 18

Gonio IOP evaluation

Answer 18

Rule out specific causes for high IOP or significantly asymmetric IOP

Question 19

Assessment of chamber width of all glaucoma patients

Answer 19

• accurately diagnose open.closed
• rule out secondary glaucoma
• evaluate angle periodically
• asses angle if IOP control is lost

Question 20

Corneal wedge aids in

Answer 20

Locating schwalbe’s line in difficult to asses angles

Location lines meet = scwalbes

Question 21

Closure possible

Answer 21

Grade 2

Question 22

Closure probable

Answer 22

Grade 1

Question 23

Even with gonio it is impossible to predict

Answer 23

Certainty of ACG

Question 24

Blood in the anterior chamber, common after blunt trauma

Answer 24

Hyphema

Question 25

Avoid performing gonio 4 weeks after

Answer 25

Onset of hyphema

Question 26

Angle recession is a tear between

Answer 26

Longitudinal and circular muscles of the ciliary muscle

Question 27

Angle recession is associated with

Answer 27

Delayed onset secondary open angle glaucoma