Sclera Anatomy Quiz

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What is the main reason the sclera appears white and opaque?

The coarse weave and variation in fibril width cause strong light scattering (correct)

The thickness of the sclera affects its opacity

The presence of ground substance maintains opacity

The density of fibroblasts contributes to the white appearance

What is the approximate thickness of the sclera just posterior to the rectus muscle insertions?

0.1 mm

0.5 mm

0.3 mm (correct)

0.7 mm

Which component is primarily responsible for maintaining the structure of the sclera?

Ground substance

Fibroblasts (correct)

Collagen fibrils

Optic nerve head

Because of the coarse weave and the variation in fibril width, the sclera scatters light strongly and appears white and ______

opaque Signup and view all the answers

The sclera is of variable thickness, 1 mm around the optic nerve head and 0.3 mm just posterior to the rectus muscle ______

insertions Signup and view all the answers

The sclera is formed from interwoven collagen fibrils lying within a ground substance and maintained by ______

fibroblasts Signup and view all the answers

What distinguishes episcleritis from scleritis?

Presence of a patch redness and mild or no discomfort Signup and view all the answers

In rare, severe cases of episcleritis, what treatment may be helpful?

Systemic non-steroidal anti-inflammatory treatment Signup and view all the answers

What is the usual nature of episcleritis?

Self-limiting with tiresome symptoms Signup and view all the answers

Episcleritis is an inflammation at the surface of the ______

sclera Signup and view all the answers

The redness caused by episcleritis is usually accompanied by mild or no ______

discomfort Signup and view all the answers

In rare, severe cases of episcleritis, systemic non-steroidal anti-inflammatory ______ may be helpful

treatment Signup and view all the answers

What is the main cause of scleritis in almost 50% of cases?

Rheumatoid arthritis Signup and view all the answers

What is the potential complication that may require scleral grafting to prevent globe perforation?

Scleromalacia perforans Signup and view all the answers

What type of treatment is typically required for severe scleritis?

Systemic immunosuppression Signup and view all the answers

______ may show diffuse or nodular swelling

The sclera Signup and view all the answers

Both inflammatory and ischaemic ______ occur

scleral lesions Signup and view all the answers

Non-steroidal anti-inflammatory agents may suffice in diffuse or nodular ______

scleritis Signup and view all the answers

Scleral grafting may be required to prevent ______ of the globe

perforation Signup and view all the answers

______ affecting the posterior part of the globe may cause choroidal effusions, or may simulate a tumour

Scleritis Signup and view all the answers

______ may be required to prevent perforation of the globe

Scleral grafting Signup and view all the answers

Both inflammatory and ischaemic ______ occur

complications Signup and view all the answers

Good hygiene and hand washing is vital if contact with -------------- conjunctivitis is suspected, to prevent spread

an adenoviral Signup and view all the answers

In contact lens wearers, a painful red eye is serious; it may imply -----------

an infective keratitis Signup and view all the answers

Redness, pain and reduced vision in a patient with corneal graft suggest --------------, which is an ophthalmic emergency

rejection Signup and view all the answers

Sclera Anatomy Quiz

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Questions and Answers

What is the main reason the sclera appears white and opaque?

What is the approximate thickness of the sclera just posterior to the rectus muscle insertions?

Which component is primarily responsible for maintaining the structure of the sclera?

Because of the coarse weave and the variation in fibril width, the sclera scatters light strongly and appears white and ______

The sclera is of variable thickness, 1 mm around the optic nerve head and 0.3 mm just posterior to the rectus muscle ______

The sclera is formed from interwoven collagen fibrils lying within a ground substance and maintained by ______

What distinguishes episcleritis from scleritis?

In rare, severe cases of episcleritis, what treatment may be helpful?

What is the usual nature of episcleritis?

Episcleritis is an inflammation at the surface of the ______

The redness caused by episcleritis is usually accompanied by mild or no ______

In rare, severe cases of episcleritis, systemic non-steroidal anti-inflammatory ______ may be helpful

What is the main cause of scleritis in almost 50% of cases?

What is the potential complication that may require scleral grafting to prevent globe perforation?

What type of treatment is typically required for severe scleritis?

______ may show diffuse or nodular swelling

Both inflammatory and ischaemic ______ occur

Non-steroidal anti-inflammatory agents may suffice in diffuse or nodular ______

Scleral grafting may be required to prevent ______ of the globe

______ affecting the posterior part of the globe may cause choroidal effusions, or may simulate a tumour

______ may be required to prevent perforation of the globe

Both inflammatory and ischaemic ______ occur

Good hygiene and hand washing is vital if contact with -------------- conjunctivitis is suspected, to prevent spread

In contact lens wearers, a painful red eye is serious; it may imply -----------

Redness, pain and reduced vision in a patient with corneal graft suggest --------------, which is an ophthalmic emergency

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