Term
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Definition
| illumination obtained with a wide slit and an out of focus beam directed at a 15-20 degree angle to scan the cornea. |
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Term
| Direct (focal) Illumination |
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Definition
| use of high power examination and a narrower slit beam to allow for more in depth exam and observation of layers including the endothelium. The beam and microscope are both focused sharply on the structure to be observed. |
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Term
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Definition
| method of illuminating a structure by using the light that is reflected from behind. This method is closely related to indirect illumination. |
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Term
| Scerotic scatter illumination |
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Definition
| Method in which the beam of light is focused on the scera near the limbus and the cornea remains uniformly dark in the absence of an opacity. An opacity will become visible if present since it scatters light. |
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Term
| Specular reflection illumination |
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Definition
| method in which the beam of light and the microscope are placed at equal angles to the surface being viewed. This method examines the quality of the surface. Especially usefull to observe the endothelium |
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Term
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Definition
| thickened area of conjunctiva at the limbus but not crossing it |
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Term
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Definition
| thickened area of conjunctiva that crosses the limbus onto the cornea |
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Term
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Definition
| detachment of the 4-5 layers of cells comprising of the epitehlium after too much cellular swelling |
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Term
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Definition
| seen as clear areas within an otherwise hazy layer of epithelium, most easily confirmed by discontinuity of the defect's edge |
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Term
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Definition
| appearance of inflammatory cells seen as grayish white discoloration in the epithelium alone |
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