Lensmeter
Lensmeter
The Lensmeter (== Template:IPA ==
The Template:IPA (International Phonetic Alphabet) is a system of phonetic notation based primarily on the Latin alphabet. It was devised by the International Phonetic Association in the late 19th century as a standardized representation of the sounds of spoken language.
Pronunciation
The pronunciation of the term "IPA" is /aɪ piː eɪ/ in English.
Etymology
The term "IPA" is an acronym for the International Phonetic Alphabet. The International Phonetic Association, founded in 1886, created the IPA to provide a single, universal system for the transcription of spoken language.
Related Terms
- Phonetic notation: A system used to visually represent the sounds of speech. The IPA is one type of phonetic notation.
- Phonetics: The study of the physical sounds of human speech. It is concerned with the physical properties of speech sounds (phonemes), and the processes of their physiological production, auditory reception, and neurophysiological perception.
- Phonology: The study of the way sounds function within a particular language or languages. While phonetics concerns the physical production, acoustic transmission and perception of the sounds of speech, phonology describes the way sounds function within a particular language or languages.
- Transcription (linguistics): The systematic representation of spoken language in written form. The source of the words transcribe and transcription, the term means "to write across" in Latin, and it's the process of converting spoken language into written form. In linguistics, this is often done using the IPA.
External links
- Medical encyclopedia article on Lensmeter
- Wikipedia's article - Lensmeter
This WikiMD dictionary article is a stub. You can help make it a full article.
Languages: - East Asian
中文,
日本,
한국어,
South Asian
हिन्दी,
Urdu,
বাংলা,
తెలుగు,
தமிழ்,
ಕನ್ನಡ,
Southeast Asian
Indonesian,
Vietnamese,
Thai,
မြန်မာဘာသာ,
European
español,
Deutsch,
français,
русский,
português do Brasil,
Italian,
polski), also known as a lensometer, vertometer, or ophthalmic lens gauge, is a specialized instrument used by optometrists and opticians to verify the correct prescription in a pair of eyeglasses. It is used to measure the power and orientation of the lenses in an eyeglass frame or from uncut lenses (also known as stock lenses).
Etymology
The term "lensmeter" is derived from the words "lens", which is a piece of glass or other transparent substance with curved sides for concentrating or disseminating light rays, and "meter", which is a device that measures and records a specific thing.
History
The lensmeter was first introduced in the early 20th century by the American optical company Bausch & Lomb. It has since become an essential tool in the optical industry for verifying the accuracy of lens power in eyeglasses.
Function
The lensmeter works by focusing light through the eyeglass lens and reading the result on a diopter scale. The device can measure the spherical power, cylindrical power, and axis of a lens, which are all necessary components in determining the correct prescription for a patient's eyeglasses.
Related Terms
- Optometry: The practice or profession of examining the eyes for visual defects and prescribing corrective lenses.
- Presbyopia: A condition associated with aging in which the eye exhibits a progressively diminished ability to focus on near objects.
- Astigmatism: A defect in the eye or in a lens caused by a deviation from spherical curvature, which results in distorted images, as light rays are prevented from meeting at a common focus.
- Myopia: A condition in which close objects appear clearly, but far ones don't.
External links
- Medical encyclopedia article on Lensmeter
- Wikipedia's article - Lensmeter
This WikiMD dictionary article is a stub. You can help make it a full article.
Languages: - East Asian
中文,
日本,
한국어,
South Asian
हिन्दी,
Urdu,
বাংলা,
తెలుగు,
தமிழ்,
ಕನ್ನಡ,
Southeast Asian
Indonesian,
Vietnamese,
Thai,
မြန်မာဘာသာ,
European
español,
Deutsch,
français,
русский,
português do Brasil,
Italian,
polski