Corn: A small callused area of skin caused by local pressure that irritates tissue over a bony prominence. Although the surface area of a corn may be small, the area of hardening actually extends into the deeper layers of skin and flesh. The inside projection of the corn is what causes discomfort. Corns most commonly occur over a toe, where they form what is referred to as hard corns. Between the toes, pressure can form a soft corn of macerated skin, which often yellows. Corns can be softened by soaking them in hot water, with or without softening agents that are available over the counter or by prescription. In some cases, minor outpatient surgery may be used to remove excess corn tissue. A corn on the toe is also called a clavus.
Corneal: Pertaining to the cornea, the clear front window of the eye that transmits and focuses light into the eye.
- Corneal abrasion
Corneal abrasion: A scratch or scrape on the cornea, the clear front window of the eye that transmits and focuses light into the eye.
- Corneal dystrophy
Corneal dystrophy: A condition in which one or more parts of the cornea lose their normal clarity due to a buildup of cloudy material. There are over 20 corneal dystrophies that affect all parts of the cornea.
- Corneal dystrophy, Cogan
Corneal dystrophy, Cogan: A disorder in which the cornea shows grayish fingerprint lines, geographic map-like lines, and dots (or microcysts). These lines and dots can be seen on examination with a slit-lamp, which focuses a high-intensity light beam through a slit while the examiner uses a magnifying scope to look at the front of the […]
- Corneal dystrophy, epithelial basement
Corneal dystrophy, epithelial basement: A disorder in which the cornea (the normally clear front window of the eye) shows grayish fingerprint lines, geographic map-like lines, and dots (or microcysts) on examination with a slit-lamp that focuses a high intensity light beam as a slit while the examiner looks at the front of the eye through […]