Acuity test, visual: This test measures how well you see at various distances. It is the familiar eye chart test.
The eye chart itself — the usual one is called Snellen’s chart — is imprinted with block letters that line-by-line decrease in size, corresponding to the distance at which that line of letters is normally visible.
The letters on Snellen’s chart are, not surprisingly, called Snellen’s test type. Each block letter is quite scientific in design (so that at the appropriate distance the letter subtends a visual angle of 5 degrees and each component part subtends an angle of 1 minute).
The chart and the letters are named for a 19th-century Dutch ophthalmologist Hermann Snellen (1834-1908) who came up with them as a test of visual acuity. Visual acuity refers to the clarity or clearness of the vision, a measure of how well a person sees. The word “acuity” comes from the Latin “acuitas” = sharpness.
- Acuity, visual
Acuity, visual: The clearness of vision, a measure of how well one sees.
- Acuity, auditory
Acuity, auditory: The clearness of hearing, a measure of how well a person hears.
Acupressure: A traditional Chinese medicine bodywork technique based on the principles of acupuncture. Acupressure is the application of pressure rather than needles on specific points on the body to control symptoms such as pain or nausea.
The practice of inserting needles into the body to reduce pain or induce anesthesia. More broadly, acupuncture is a family of procedures involving the stimulation of anatomical locations on or in the skin by a variety of techniques. There are a number of different approaches to diagnosis and treatment in American acupuncture that incorporate medical […]
Acupuncturist: A person skilled in the practice of acupuncture, who may or may not be credentialed by an accrediting body.