Pupil Measurements - Special Considerations - NeurOptics NPi-300 Pupillometer Gebrauchsanweisung

Pupil Measurements – Special Considerations
Blinking During Measurement
If the measurement was affected by a tracking problem (e.g., blinks), then
measurement results are all displayed in red font on the results screen and NPi
is reported as "Rescan" (Ex. 34). In this case, the measurement results are not
valid and should not be relied upon and the measurement should be repeated.
Non-Responsive Pupil
In case of a non-responsive pupil, before reporting the results on the LCD
screen, the measurement is automatically repeated for confirmation. The
operator is simply asked to wait a few more seconds before removing the
device (Ex. 35).
Small "Pinpoint" Pupil Measurement
Pupillometer Resolution Threshold: Pupil Size
The NPi-300 Pupillometer measurement threshold for measuring pupil size is 0.80 mm, which means the
pupillometer can measure pupils as small as 0.8 mm in diameter. If the pupil size is < 0.8 mm, the pupillometer
will not detect the pupil, and it will not initiate a measurement.
Pupillometer Resolution Threshold: Change in Pupil Size
The NPi-300 Pupillometer's minimum measurement threshold for detecting a change in pupil size is 0.03 mm
(30 microns). In the event a change in pupil size is < 0.03 mm, the pupillometer will not be able to measure a
change in pupil size, and it will display an NPi of 0.
NPi Measurement of "0"
The NPi-300 Pupillometer will measure an NPi of 0 in the following clinical assessment scenarios:
• Non-Reactive response = Non-reactive pupillary response; no pupillary light reflex (PLR) waveform.
• Immeasurable response = Change in pupil size < 0.03 mm (30 microns).
• Atypical response = An abnormal pupillary light reflex (PLR) waveform.
The Neurological Pupil index™ (NPi®) Pupil Reactivity Assessment Scale
Measured Value*
3.0 – 4.9
< 3.0
0
*A difference in NPi between Right and Left pupils of ≥ 0.7 may also be considered an abnormal pupil reading
NeurOptics® NPi®-300 Pupillometer System—Instructions for Use ©2021 NeurOptics, Inc.
Assessment
Normal/"Brisk"
Abnormal/"Sluggish"
Non-Reactive, Immeasurable, or Atypical Response
*Per the Neurological Pupil index (NPi) algorithm
Ex. 34
Ex. 35
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