AC TO LENS - Angle

Question 1

What are the borders of the anterior chamber?

Answer 1

ANTERIOR : posterior cornea
POSTERIOR: anterior iris

Question 2

How deep is the anterior chamber?

Answer 2

3mm

Question 3

Is the anterior chamber shallower in hypermetropes or myopes?

Answer 3

Shallower in hypermetropes - Axial length is smaller

Question 4

How much aqueous humor is present in the anterior chamber?

Answer 4

0.25ml

Question 5

What are the structures of the angle of the anterior chamber? (6)

Answer 5

1. Iris Root
2. Ciliary Body
3. Scleral Spur
4. Trabecular meshwork (posterior/pigmented)
5. Trabecular meshwork (anterior/not-pigmented)
6. Schwalbe’s line

I CAN SEE TILL SCHWALBE’S LINE

Question 6

What is the scleral spur

Answer 6

At the junction of the limbus, internally there is a groove/indendation called the scleral sulcus.
A projection posterior from this area and is called the scleral spur

Question 7

What is the ciliary body band?

Answer 7

Ciliary body is attached to scleral spur - a space exists here called the supraciliary space bewteen the ciliary body and sclera

Iris inserts into anterior side of ciliary body, and part of the ciliary body between iris and scleral spur is ciliary band, which is seen on gonioscopy

Question 8

What is Schlemm’s Canal?

Answer 8

A Continuation of trabecular meshwork as a canal - it is oval in shape and is lined by endothelium

It is perforated by aqueous collector channels which branch into intrascleral and deep scleral plexi

Question 9

What is Schwalbe’s line

Answer 9

Trabecular meshwork inserts into the periphery of the cornea at a ridge, known as Schwalbe’s line - marks the end of Descemet’s membrane of the cornea

Most anterior structure of gonioscopy

Question 10

What is posterior embryotoxon?

Answer 10

Anterior displacement of Schwalbe’s line which is prominent on external exmination - associated with eisenfeld riger syndrome

Question 11

What is Sampaoelsi’s line?

Answer 11

Pigmented Schwalbe’s line seen in PXF and pigment dispersion syndrome

Question 12

What are the main age related changes seen in the trabecular meshwork? (5)

Answer 12

1) Increased pigmentation
2) Increased debris accumulation
3) Increased glycosaminoglycan deposition in extracellular space
4) Thickened basement membrane
5) Reduced endothelial cells