Anterior Chamber Flashcards
Which Van Herick grade would a gap which is 50% of the corneal thickness be?
3
Which Van Herick grade would a gap which is 30% of the corneal thickness be?
3
Which Van Herick grade would a gap which is 20% of the corneal thickness be?
1
Which Van Herick grade would a gap which is 25% of the corneal thickness be?
2
Which Van Herick grade would a gap which is 5% of the corneal thickness be?
1
Which Van Herick grade would a gap which is 100% of the corneal thickness be?
4
Which Van Herick grade would a closed angle be?
0
State the order of anterior chamber structures from anterior to posterior.
Schwalbe’s line
Trabecular Meshwork
Canal of Schlemm
Scleral spur
Ciliary body
Iris
What is the appearance of Schwalbe’s line and where does it sit within the anterior chamber?
A white/translucent line marking the end of the cornea at Descemet’s membrane
If Schwalbe’s line is pigmented, what is it known as?
Sampolesi’s line
What is the appearance of the trabecular meshwork and where does it sit within the anterior chamber?
Translucent/grey/brown line between Schwalbe’s line and the scleral spur
What is the appearance of the ciliary body and where does it sit within the anterior chamber?
Black/grey/brown and only visible if wide angle between the iris root and scleral spur
What is the appearance of the scleral spur and where does it sit within the anterior chamber?
Bright white line between the trabecular meshwork and the ciliary body
What is the appearance of the Canal of Schlemm and where does it sit within the anterior chamber?
Not normally visible, only if filled with blood. Found between trabecular meshwork and scleral spur
What are the identifying features of Ocular Hypertension?
Raised IOP
Normal disc appearance
Normal visual field
What are the identifying features of POAG?
Open angle
Any IOP
Disc changes
VF changes
What are the identifying features of Secondary Glaucoma?
Blocked/partially blocked drainage
Any IOP
Disc changes
VF changes
What are the identifying features of closed angle glaucoma?
High IOP
Closed/partially closed angles
Disc changes
VF changes
What are the types of angle closure glaucoma?
Angle closure suspect
Intermittent angle closure
Acute angle closure
Chronic angle closure
What are the signs of angle closure suspect?
Narrow angles/chamber
Occludable angle
What are the signs of intermittent angle closure glaucoma?
Narrow angles/chamber and an occludable angle normally
High IOP and corneal swelling during attacks
What are the signs of acute angle closure glaucoma?
Red eye
Narrow angles
Corneal Oedema
Very high IOP
Fixed, oval pupil
What are the signs of chronic angle closure glaucoma?
Optic disc changes
Peripheral anterior synechiae (visible on gonioscopy)
What causes chronic angle closure glaucoma?
Synechiae causing progressive angle closure
What are the symptoms of intermittent angle closure glaucoma?
Transient blurred vision
Headaches
Haloes
(During attacks)
What are the symptoms of acute angle closure glaucoma?
Severe pain
Nausea
Blurred vision
Haloes
Are there any symptoms for angle closure suspect and chronic angle closure glaucoma?
No
How should you manage acute angle closure glaucoma?
Emergency referral
How should you manage chronic angle closure glaucoma?
Refer for laser iridotomy
How should you manage intermittent angle closure glaucoma and suspect angle closure?
Refer for prophylactic (preventative) laser iridotomy
On the shadow test, what is classed as grade 2?
50% of nasal iris in shadow
What should be done if the shadow test result is grade 2 or below?
Van Herick or gonioscopy
