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32 Cards in this Set
- Front
- Back
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Light rays propagating in two perpendicular planes have different foci.
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Astigmatism
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Steepest curvature lies in the vertical meridian
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With the rule astigmatism
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Horizontal meridian is the steepest
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Against the rule astigmatism
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Meridians that contain the greatest differences are not along the 180 and 90 meridians
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Oblique astigmatism
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Covers the anterior surface of the cornea
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Tear film
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Top layer of the cornea
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Corneal epithelium
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Three layers of the corneal epithelium
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Surface cells
Wing Cells Basal cells |
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Middle layer of the cornea is made up of what?
What are the bundles called? |
collagen fibrils
Lamellae |
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Flat cells that lie in between and sometimes within the lamellae
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Fibroblasts
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CC: corneal degenerative dystrophy that first presents with focal disruptions of the basement membrane and Bowman's layer
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Keratoconus
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Cone shape in Keratoconus is called
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Munson's sign
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Endothelium of cornea can make lots of basement material, which are seen as periodic thickenings in Descemet's membrane.
On periphery? In the center? |
P: Hassal-Henle bodies
C: Corneal guttata |
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Bilateral, non-inflammatory loss of endothelial function
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Fuch's Dystrophy
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Swelling in the cornea
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Corneal edema
Directed posteriorly, anterior curvature remains the same |
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Which layer of the cornea will not regenerate if damaged?
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Bowman's layer
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Acute overexposure to UV radiations effects the corneal epithelium and causes ...?
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Photokeratitis
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Loss of corneal sensory innervation is called
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Neurotrophic Keratitis
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Where does the cornea get it's oxygen?
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From the atmosphere
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Excessive ingrowth of blood vessels from the limbal vasculature into the cornea, caused by low oxygen is called...
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Neovascularization
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Procedure where the cornea is replaced by a donor cornea
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Penetrative keratoplasty
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In cornea, incision is made to produce a flap consisting epithelium and Bowman's layer. This flap is folded back, and the stroma is removed by laser. The flap is laid back down, and the edges seal as the epithelium heals. This is called...
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LASIK
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Posterior 5/6 of the connective tissue of the globe.
-Maintains shape of the globe, offers resistance to internal and external forces. |
Sclera
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Loose, vascularized, connective tissue tissue layer that lies just outer to the sclera
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Episclera
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A newborn may have a bluish tint in the sclera because ...
Yellow because... |
The underlying pigmented vascular uvea shows through
Fatty deposits |
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The optic nerve passes through the posterior scleral foramen, which is bridged by a network of scleral tissue .... interwoven collagen fibers forming canals through which he optic bundle passes
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Lamina cribrosa
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CC: Pressure in eye increases, lamina cribrosa will be effected, and what what will happen to the optic nerve as it passes through?
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Optic Nerve Cupping
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Does the sclera have any blood supply?
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No. Avascular.
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Radial projections of limbal epithelium and stroma that extend into the cornea in spike-like fashion
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Palisades of Vogt
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Iron deposits in the epithelial cell cytoplasm, more concentrated in the basal cells, produce a horizontally pigmented line
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Hudson-Stahli line
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Yellow-white deposit located in the peripheral stroma.
-Most common aging change |
Corneal arcus
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What type of dye is used to evaluate the barrier function of the cornea?
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Fluorescein
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CC: when the epithelial cells fail to attach to Bowman's layer.
-Continual or periodic -Painful because corneal nerves are exposed |
Recurrent corneal erosion
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