Age-related hearing loss with gradually progressive inability to hear, especially high frequency sounds. Presbycusis most often occurs in both ears, although not necessarily at the same time or rate. Because the loss of hearing is so gradual, people with presbycusis may not realize that their hearing is diminishing. They may have trouble distinguishing and understanding conversation in a noisy setting. Environmental exposures (such as to guns, power tools, industrial machinery, or very loud music) contribute significantly to presbycusis, but up to half of presbycusis is genetically determined. Presbycusis is common, affecting a third of people between 65 and 75 years and up to a half of people 75 and over. The hearing loss can usually be corrected with a hearing aid.
The loss of the eye’s ability to change focus to see near objects. The reasons for this loss of the power of accommodation are not yet fully known. It is conventionally said to be due to the lens becoming less elastic with time. Presbyopia is associated with aging. It occurs in everyone. The first sign […]
A physician’s order for the preparation and administration of a drug or device for a patient. A prescription has several parts. They include the superscription or heading with the symbol “R” or “Rx”, which stands for the word recipe (meaning, in Latin, to take); the inscription, which contains the names and quantities of the ingredients; […]
- Prescription drug
A drug requiring a prescription, as opposed to an over-the-counter drug, which can be purchased without one.
- Presentation, breech
Birth in which the buttocks present before the head.
- Presentation, footling
There are single-footling or double-footling presentations depending upon whether the presenting part of the baby at delivery is just one foot or both feet.