eye chambers

Question 1

what is the angle of anterior chamber?

Answer 1

• angle between the posterior cornea & anterior iris surface
• function
  > for outflow of aqueous humour (drainage of aqueous)
• structure related to the angle
  > trabecular meshwork
  > schlemm’s canal
  > scleral spur

Question 2

dynamics of aqueous humour

Answer 2

Normal IOP results from a dynamic balance between the rate of aqueous production into the posterior chamber and aqueous drainage from the anterior chamber.

Question 3

aqueous humour production

Answer 3

three(3) mechanism of aqueous formation

• diffusion
• ultrafiltration
• active transport

Question 4

aqueous humour drainage (conventional pathway)

Answer 4

1. accounts for 90% of aqueous production
2. through trabecular mesh work
3. schlemm’s canal
4. ~25 collector channels
5. aqueous veins
6. episcleral veins & anterior ciliary veins to mix w blood

Question 5

aqueous humour drainage (unconventional pathway)

Answer 5

1. accounts for 10% of aqueous drainage
2. starts from anterior surface of ciliary body
3. suprachoroidal space
4. vortex veins/venous circulation (venous drainage)
5. into the ciliary body, choroid & sclera

Question 6

normal IOP values

Answer 6

average
- 15.5mmHg
normal range
- 10-21mmHg

Question 7

abnormal IOP

Answer 7

• Abnormal IOP results if the balance between the rate of aqueous production and rate of aqueous drainage is disturbed.
• This may indicate a pathology, such as glaucoma.

Question 8

general arrangement of vitreous humour

Answer 8

• A transparent gel that fills the space between the lens and retina.
• The vitreous is attached to the following parts of the eye:
  > posterior lens surface
  > ora serrata
  > para-vascular areas
  > para-macula area
  > optic disc

Question 9

purpose of vitreous humour

Answer 9

The vitreous is in contact with the retina, and keeps the retina in place by pressing against the choroid.

Question 10

age-related change in vitreous humour

Answer 10

With age, the vitreous undergoes degeneration

- Develops pockets of fluid and shrinks away from the retina, cause vitreous detachment