A plastic ring that is designed to be implanted in the cornea, the transparent structure at the front of the eye, to flatten the cornea and thereby reduce the degree of nearsightedness (myopia). The ring is placed in the corneal stroma, the middle of the five layers of the cornea.
- Ringing in the ears
Medically called tinnitus, can be due to many causes including ear infections, fluid in the ears, Meniere syndrome (the combination of tinnitus and deafness), some medications such as aspirin and other nonsteroidal anti-inflammatory drugs (NSAIDs), aging, and ear trauma (such as from the noise of planes, firearms, or loud music). In rare situations, tinnitus may […]
- Ringworm (tinea)
Ringworm is a fungal infection of the skin previously thought to be due to a parasite (worm). The medical term for ringworm is tinea. The skin infections are sometimes characterized by round lesions in the upper layers of the skin. Fungi that cause ringworm are known as dermatophytes.
- Ringworm of the nails
People with diabetes; People with disease of the small blood vessels (peripheral vascular disease); and Women of any age who wear artificial nails (acrylic or “wraps”). Artificial nails increase the risk for onychomycosis because, when an artificial nail is applied, the nail surface is usually abraded with an emery board damaging it, emery boards can […]
- Riot control agent poisoning
rhinorrhea, burning, irritation, edema
- RIRS (retrograde intrarenal surgery)
Retrograde intrarenal surgery (RIRS) is a procedure for doing surgery within the kidney using a viewing tube called a fiberoptic endoscope. In RIRS the scope is placed through the urethra (the urinary opening) into the bladder and then through the ureter into the urine-collecting part of the kidney. The scope thus is moved retrograde (up […]