Select the FALSE statements

Damage to the corneal endothelium during RK is a minor problem

In the lasik procedure the epithelial layer is also removed completely similarly to PRK

The cornea is the major refractive element of the eye (+48D)

Corneal curvature and axial length determine power of the eye Corneal curvature and axial length determine power of the eye Corneal curvature and axial length determine power of the eye

Cataract surgery was the first type of refractive surgery

Damage to the corneal endothelium during RK is a minor problem

In the lasik procedure the epithelial layer is also removed completely similarly to PRK

Select True statements regarding the corneal epithelium

Basal cells undergo mitosis to produce wing cells

In wing cells we see internal degradation of the organelles of the cell

Superficial cells contain only cytoplasm and no debris

Basal cells undergo mitosis to produce wing cells

In wing cells we see internal degradation of the organelles of the cell

Superficial cells contain only cytoplasm and no debris

The epithelium of the cornea in general is very different in lifecycle and characteristic from the epithelium of the skin.

Like the epithelium of the skin, the epithelium of the cornea excretes keratin

Major points of reflection include:

Epithelium - and Bowman's interface

Select false statements:

Stroma swells parallel to its surface

Collagen fibrils pull H20 into the cell

Stromal swelling pressure is the mechanical load/unit area required to maintain the tissue at a fixed water content

Stroma swells parallel to its surface

Collagen fibrils pull H20 into the cell

GAGS are the origin of swelling pressure

Swelling pressure is reduced over time in contact with aqueous solutions, GAGS lost to the solution

Substances that precipitates GAGS decrease swell pressure

Ocular Physiology - Cornea: Midterm 1

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Mchllmijares

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Quizzes Created: 23 | Total Attempts: 12,849

Questions: 20 | Attempts: 686 | Updated: Mar 22, 2023

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Ocular Physiology - Cornea: Midterm 1 - Quiz

Questions and Answers

Ocular Physiology - Cornea: Midterm 1

Na+fluorescein is taken up by damaged epithelial cells.

Select the FALSE statements

The epithelium: A. Has superficial cells, wing cells and basal cells B. Three types of collagen (IV, VII, XII) C. Contains MPS, keratocyes D. Is one cell layer thick with tight juntions

Desmosomes (where two cells come together) help to prevent the flow of substances b/t cells

A tight junction is where two cell membranes fuse together. Also only carbon dioxide, O2 and small ions through

Gap junction don't allow passage b/t cells. They keep the wing cells and basal cells from becoming electrically coupled

Select True statements regarding the corneal epithelium

You view the endothelium of the cornea with specular reflection

Only the corneal endothelium and epithelium have tight junctions.

What conditions must be met in order for large particle light scatter to occur? A. An interface with refractive index different from the medium. B. The interface has to be longer than 1 wavelength C. A photon must be lost and energy given off as heat.

Major points of reflection include:

It is theoretically possible to have small particle light scatter at every collagen fibril.

Select false statements:

Water added to the stroma only adds to its thickness, not diameter

The ___________ Hypothesis explains the maintenance of stromal hydration and for that matter transparency.

Both epi and endo pump water, but greater than 905 of the water pumping is provided by the endothelium. Blockingthe endothelium essentially eliminates fluid transport.

Which of the following do you need to know in order to calculate the flow across the tissue for a given pressure? A. Flow conductivity B. Thickness of a tissue C. Area of a tissue

Darcy's law of bulk flow tells us how much water flows through the cornea

Fluid transport in the cornea requires Na+, Cl- and HCO3-