What does a Pupilometer do?

What does a Pupilometer do?

Pupilometer, also spelled pupillometer, is a name for two different devices—one used to measure the pupillary light reflex, and the other used in ophthalmology, which measures the distance between pupils through visual stimuli.

What is a normal PD for eyes?

An average PD measurement is about 62mm for women and 64mm for men. For children the measurement usually ranges from 41 to 55 mm.

How do you measure pupillometer with PD?


  1. Have the patient look at your bridge center.
  2. Place the zero point of the rule at the inner pupil margin of the right eye and measure near PD to the outer pupil margin of the left eye.
  3. A penlight can light the visual PD and improve accuracy and consistency.

What does NPi mean in pupillometer?

Neurological Pupil index
The Neurological Pupil indexTM (NPi) and pupil constriction velocity (CV) are two distinct variables that can be observed and measured using a pupillometer.

What is Pupilometer and how is it useful in business research?

A device used to measure the dilation of a participant’s pupil in response to a visual stimulus.

How is Pupillometry measured?

Automated pupillometry involves the use of a pupillometer, a portable, handheld infrared device that provides a reliable and objective measurement of pupillary size, symmetry, and reactivity through measurement of the pupil light reflex.

What happens if my PD is off by 2mm?

If the PD measured was 2mm off initially, by using a millimeter rule, the net cumulative error might be 4.5mm or more.

What is normal NPi?

The Neurological Pupil index (NPi®), calculated by the Pupillometer, reflects a comparison of all measured variables in the PLR to known normal observations. On the numeric NPi® scale, an NPi® from 3.0 to 4.9 is considered normal, while an NPi® less than 3.0 is considered abnormal.

What NPi means?

National Provider Identifier Standard
The National Provider Identifier (NPI) is a Health Insurance Portability and Accountability Act (HIPAA) Administrative Simplification Standard. The NPI is a unique identification number for covered health care providers.

What device measures potential difference?

A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit.

How is the size of the pupil measured?

Pupil size is traditionally measured using a pupil gauge to estimate the diameter in millimeters of the pupil at rest before any light is shone into the eye—pupils should be of similar size. Manual measurement is subjective and prone to error.

How is pupil reactivity expressed in a pupillometer?

Pupil reactivity expressed numerically so that now changes in both pupil size and reactivity can be trended over time, just like other vital signs

What does it mean when your pupillary distance is wrong?

If you’ve ever tried on a pair of eyeglasses and experienced (ouch!) instant eye strain, the reason could be right between your eyes, meaning your pupillary distance could have been measured incorrectly. Your pupillary distance (PD) — the distance between your pupils — determines comfort and how well your glasses fit.

What kind of device is the npi-200 pupillometer?

The NPi-200 Pupillometer is a hand held device that provides accurate, reliable and objective pupil size and reactivity data, independent of examiner. NeurOptics provides pupillometry instrumentation offering monocular or binocular for human and animal research across all research applications.