pupillometer


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pupillometer

 [pu″pĭ-lom´ĕ-ter]
an instrument for measuring the width or diameter of the pupil.

pu·pil·lom·e·ter

(pyū'pi-lom'ĕ-tĕr),
An instrument for measuring and recording the diameter of the pupil.
[pupillo- + G. metron, measure]

pu·pil·lom·e·ter

(pyū'pi-lom'ě-tĕr)
An instrument for measuring and recording the diameter of the pupil.
[pupillo- + G. metron, measure]

pupillometer 

1. An instrument for measuring the diameter of the pupil. There exist several types but the most common is a series of graduated filled circles whose sizes are compared with the pupil (Haab's pupillometer). It is also common to measure pupil size by photography or video after appropriate calibration of the method (Fig. P25). Syn. coreometer.
2. Although incorrectly used, it refers to an instrument for measuring the interpupillary distance (PD). These instruments are based either on using the pupil centres (e.g. Reichert PD gauge) or the corneal reflections (e.g. Essilor Corneal Reflection Pupillometer; Seiko SP-100 Pupillometer), but the latter can be used on the basis of the pupil centres as well. In the instruments using corneal reflections the subject views the image of a small illuminated target surrounding the observation aperture used by the examiner or made to appear as if it came from the observer's eye. That image is formed at infinity by a lens placed in front of the subject's eyes. The examiner moves a hair line to coincide with the centre of the corneal reflections and reads the monocular and total interpupillary distances. Syn. interpupillometer (this is the most appropriate term for this instrument); PD gauge; PD meter. See PD rule.
Fig. P25 Typical pupillometerenlarge picture
Fig. P25 Typical pupillometer

pupillometer

an instrument for measuring the width or diameter of the pupil.
References in periodicals archive ?
The pupillometer operation method was as follows: The user would press the LEFT scan button when detecting the left eye, and press the RIGHT scan button for the right eye.
On the basis of previous experiments, the PLR indices of the confined and loose sows with different ages at the weaning stage were recorded using the NeurOptics PLR-200 pupillometer (Neur Optics Inc.
Its first product was a pupillometer for precise pupil measurement and this is now the global gold standard in the laser surgery industry, and is produced and sold under licence with Haag-Streit of Switzerland.
The ForSite[TM] pupillometer (NeurOptics, San Clemente, CA) is a new medical device designed to capture and analyze pupil dynamics (Fig.
Each set of measurements was obtained in the same order: visual assessment by a volunteer ICU nurse, measurement using the pupil gauge, and measurement using the ForSite pupillometer.
The NeurOptics NPi([TM])-100 Pupillometer was used to obtain pupillary measurements during 30 cardiopulmonary resuscitations at the University of California, San Francisco Medical Center.
The NPi([TM])-100 Pupillometer uses infrared imaging technology to measure the pupil's response to light stimulus, removing subjectivity and variability in the measurement of pupil size and the pupillary light reflex.
Surely the argument for not specifying the PD on a prescription should centre on the fact that, although it may be a constant value for an orthophoric patient viewing a distant object (differences between ruler measurements and pupillometer measurements notwithstanding), the measured PD is not necessarily the correct specification for the centration distance.
In an emerging approach, a handheld pupillometer is used to assess pupillary responses as an indirect measure of ICP.
The test requires that an exact amount of a specially prepared solution of the cholinergic antagonist, tropicamide, be placed in one eye of the patient, and the rate of pupil dilation is measured using a pupillometer.
The purpose of this study was to test the accuracy and reliability of an automated pupillometer compared with the standard manual examination as a preliminary step in assessing the usefulness of automated pupillometry in the critical care setting.