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Corneal Ulcer Learning Center
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Bacteria are prokaryotes (unicellular organisms with no membrane-enclosed nucleus) with simple structures that typically range in size from about 0.5 to 20 micrometers.
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The dermatophytes are molds that can invade the stratum corneum of the skin or other keratinized tissues derived from epidermis, such as hair and nails. They may cause infections (dermatophytoses) at most skin sites, although the feet, groin, scalp, and nails are most commonly affected. 1 The dermatophytes are among the earliest microorganisms that were found to cause infections in humans.
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Fungi are types of parasitic plants that include molds, mildew, and yeast. A fungal infection is an inflammatory condition in which fungi multiply and invade the skin, the digestive tract, the genitals, and other body tissues, particularly, the lu...
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Fungal infections of the skin are among today's most common infectious diseases, and they occur worldwide. Superficial fungus infections fall into three broad categories: the dermatophytes (ringworm), tinea versicolor, and cutaneous candidiasis (y...
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Vitamin A deficiency exists when the chronic failure to eat sufficient amounts of vitamin A or beta-carotene results in levels of blood-serum vitamin A that are below a defined range. Beta-carotene is a form of pre-vitamin A, which is readily conv...
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Corneal injury describes an injury to the cornea, the crystal clear (transparent) tissue covering the front of the eye. See also: Corneal ulcers and infections
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A virus is an infectious agent, often highly host-specific, consisting of genetic material surrounded by a protein coat.
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Contact lenses are small, light-weight plastic devices worn on the eye that correct refractive errors in vision . While they appear to be worn in direct contact with the cornea, they actually float on a layer of tears that separates them from the ...
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Eyeglasses and contact lenses are devices that correct refractive errors in vision. Eyeglass lenses are mounted in frames that are worn on the face, sitting mostly on the ears and nose, so that the lenses are positioned in front of the eyes. Conta...
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Clear or slightly colored plastic lenses worn directly on the eyeball to correct vision problems, held in place over the cornea by a thin layer of tears. The concept of corrective lenses that sit directly on the eyeball was developed in the ninth ...
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Eyeglasses and contact lenses are devices that correct refractive errors in vision. Eyeglass lenses are mounted in frames worn on the face, sitting mostly on the ears and nose, so that the lenses are positioned in front of the eyes. Contact lenses...
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The eye will often clear itself of tiny objects, like eyelashes and sand, through blinking and tearing. If not, take these steps: Do not rub the eye. Wash your hands before examining it. Examine the eye in a well-lighted area. To find the object, ...
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