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Pupillometer is the name used for two different devices—one that measures the distance between pupils, and one that measures the pupil's response to visual stimuli. == Pupillary distance measurement == In the most common sense, a Pupilometer is a tool for measuring pupillary distance (PD). It is used for fitting eyeglasses so that the lenses are centered in the visual axis. This is the most common nomenclature. It may also be used to verify a PD measurement taken from a millimeter ruler placed across the bridge of a patient's nose for distance and near focus. There are a variety of ways of measuring one's pupil distance. Historically a ruler is used by optometrists. State of the art are video centration devices which provide higher accuracy and repeatability compared to manual measurements.〔(''In German: Moderne Videozentriersysteme und Pupillometer im Vergleich, Teil 1'', PD Dr. Wolfgang Wesemann, DOZ 6-2009 )〕 The accuracy is especially a concern for progressive lenses where small deviations severely reduce the performance of the lens. In addition to having it measured when one visits an optometrist, there are a variety of mobile phone apps and web apps that a person can use. The apps are available for the iPhone, iPod touch, and iPad. The web app is used by a variety of online sellers of eyeglasses.,.〔(The Pupil Meter )〕〔(The Pupil Meter )〕〔(The Pupil Meter )〕〔(The Pupil Meter )〕 In order to use the phone app or web app, a camera and a credit card with a magnetic strip are needed to assist in the measuring processes. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pupilometer」の詳細全文を読む スポンサード リンク
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