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Clinical Anatomy and Physiology of the Visual system - Lee Ann Remington > 2 - Cornea and Sclera > Flashcards

2 - Cornea and Sclera Flashcards

1
Q

What is the radius size of the cornea?

A

8 mm

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2
Q

What is the radius size of the sclera?

A

12 mm

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3
Q

What is the radius of curvature of the anterior part of the cornea?

A

7.8 mm

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4
Q

What is the radius of curvature of the posterior part of the cornea?

A

6.5 mm

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5
Q

What is the central corneal thickness?

A

0.53 mm

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6
Q

What is the periphery corneal thickness?

A

0.71 mm

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7
Q

What is the profile description of the Cornea?

A

Elliptic

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8
Q

What type of astigmatism could be characterized if the Rx. would be within 90 degrees?

A

Irregular Astigmatism

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9
Q

True or False. The Cornea is vascular.

A

False.

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10
Q

Since the anterior part of the Cornea is covered by a tear film. What is the posterior bordered with?

A

Aqueous filled anterior chamber

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11
Q

Name the 5 layers of the Cornea.

A

Epithelium, Bowman’s Layer, Stroma, Descemet’s membrane and Endothelium

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12
Q

Approx. how many cells thick is the outer most layer of the stratified corneal epithelium?

A

5 to 7 cells thick

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13
Q

The surface later of the corneal epithelium is __ cells thick.

A

2

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14
Q

True or False. Non keratinized squamous cells contain an oval nucleus.

A

False. It is a flattened nucleus

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15
Q

What product is secreted that adjoins the mucin layer of the tear film?

A

Glycocalyx

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16
Q

In regards to Zonula Occludens, does fluid go between the cells or through them?

A

Through them.

17
Q

The middle layer of the corneal epithelium is made up of what cells and how many layers do they consist of?

A

Wing cells. 2 to 3 layers worth.

18
Q

What is the distinct shape of a wing cell?

A

Polyhedral

19
Q

What type of cells occupy the innermost layer of the corneal epithelium?

A

Basal cell layer

Note: It is composed of a single layer of columnar cells and have oval shaped nucleus

20
Q

What type of junctions, namely 2, join together columnar cells?

A

Desmosomes and gap junctions

21
Q

Out of the 3 layers of the epithelium, which layer does mitosis only occur?

A

Basal cell layer

22
Q

What holds together keratin filaments in the basement membrane?

A

Hemidesmosomes

23
Q

Where does cell proliferation occur in regards to epithelial replacement?

A

Basal Layer

24
Q

What is the time frame for the turnover of the entire corneal epithelium?

A

7 days

25
Q

What is recurrent corneal erosion?

A

Condition in which the corneal epithelium sloughs off either continually or periodically.

26
Q

What is Bowman’s layer mainly consist of?

A

Interwoven collagen fibrils within a mucoprotein ground substance

Clinical Anatomy and Physiology of the Visual system - Lee Ann Remington (5 decks)

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