What part of the eye does the vitreous humour fill?
The posterior segment (vitreous cavity).
What are the physical characteristics of the vitreous humour?
It is colourless, transparent, and gelatinous (similar to egg-white).
What is the approximate volume of the vitreous humour?
About 4 mL.
What functional role does the vitreous play in the eyeball?
It helps form the ocular media and provides shock absorption due to its viscoelastic nature.
Is the vitreous humour cellular or acellular?
Acellular (contains no cells).
What are the main components of the vitreous humour?
Hyaluronic acid and type II collagen fibrils.
What percentage of the vitreous humour is water?
99%, the highest water content of any body tissue.
What forms the hyaloid membrane?
Condensed vitreous collagen fibrils and proteins.
Where is the hyaloid membrane located?
Adjacent to the retina.
How strongly is the vitreous adherent to the retina?
Only slightly adherent at the internal limiting membrane via gel fibrils.
Which area represents the strongest vitreous attachment?
The vitreous base at the junction of the pars plana and the ora serata.
What annular ring attaches the vitreous to the lens?
Wieger’s ligament (a 9 mm annular ring).
Which other structure is attached at the Wieger’s ligament?
The posterior zonules.
Where does the vitreous attach around the optic disc?
At the vitreopapillary adhesion (posterior pole)
What may be produced if this attachment detaches?
A Weiss ring (circular floater).
How does the macular attachment change with age?
It weakens over time.
What can vitreous traction at the macula cause?
A macular hole.
What is Cloquet’s canal?
A central canal running from the optic disc through the vitreous to the posterior lens surface.
What does Cloquet’s canal contain?
Remnants of the primitive vitreous.
What structure originally occupied the canal during development?
The foetal hyaloid artery.
What happens if the hyaloid artery does not regress fully in gestation?
Hyaloid remnants may persist.
