Ophthalmoscopy Flashcards

1
Q

How thick is the cornea?

A

0.5mm

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2
Q

What are the layers of the cornea

A

OUTSIDE

1 Epithelium (several cells thick)

2 Bowman’s membrane

3 Stroma (made of collagen)

4 Descemet’s membrane

5 Endothelium (1 cell thick, never regrows which maintains dehydration)

ANTERIOR CHAMBER

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3
Q

What is the refractive index of the cornea?

A

40 dioptres

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4
Q

What specialist cells does the conjunctiva contain?

A

mucin-secreting goblet cells

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5
Q

What are the layers of the iris?

A

1) stoma = contains sphincter pupillae muscle and determines colour of iris
2) Pigment epithelium contians a greater amount of pigment and the dilator pupillae

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6
Q

What are the functions of the ciliary body?

A

aqueous secretion

accommodation

influences aqueous outflow

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7
Q

What is the function of the retinal pigmented epithelium?

A

provides

functional and

metabolic

support for the photoreceptors

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8
Q

What is the uvea?

A

The iris, ciliary body, and choroid collectively.

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9
Q

What is the membrane called between the choroid and retina?

A

Bruch’s membrane

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10
Q

What is the blood supply to the retina

A

Central 2/3rds is retinal blood vessels

Outer 1/3 is choroidal blood vessels

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11
Q

Why is the optic nerve thicker outside the orbit?

A

It is myelinated

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