Comparison of 2 multiple-measurement infrared pupillometers to determine scotopic pupil diameter

Michel, Alan W.; Kronberg, Benjamin P.; Narváez, Julio; Zimmerman, Grenith

doi:10.1016/j.jcrs.2006.07.019

Cited by 18 publications

(7 citation statements)

References 20 publications

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“…9 Our data indicate that monocular pupillometry either with the Neuroptics or Colvard pupillometer is at least as accurate as using the Procyon. These fi ndings are similar to the studies of Kohnen et al 11 and Michel et al 15 Another problem of the Procyon P3000 is the lack of automated outlier recognition, which makes it neces- Comparison of Three Pupillometers/Schallenberg et al sary to check every measurement to select appropriate frames to be analyzed. Low light-adapted pupil diameter is strongly infl uenced by age.…”

Section: Discussionsupporting

confidence: 83%

Comparison of the Colvard, Procyon, and Neuroptics Pupillometers for Measuring Pupil Diameter Under Low Ambient Illumination

Schallenberg¹,

Bangre²,

Steuhl³

et al. 2010

J Refract Surg

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Pupil diameters under both light conditions were largest with the Neuroptics pupillometer and smallest with the Procyon. The most "examiner independent" Procyon pupillometer performed poorly. The underestimation of the pupil diameter might have severe consequences for refractive surgery patients. The Neuroptics pupillometer showed a high interobserver agreement and repeatability and therefore high safety.

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Section: Discussionsupporting

confidence: 83%

Comparison of the Colvard, Procyon, and Neuroptics Pupillometers for Measuring Pupil Diameter Under Low Ambient Illumination

Schallenberg¹,

Bangre²,

Steuhl³

et al. 2010

J Refract Surg

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“…Good correlation has also been found in comparison to other digital pupillometers (Michel et al, 2006). Taylor et al (2003) studied more than 2,432 paired pupillometry measurements under a variety of normal and clinical conditions and concluded the Forsite was "a reliable technology capable of providing repetitive data on quantitative pupillary function in states of health and disease."…”

Section: Introductionmentioning

confidence: 83%

Changes in Pupil Dynamics at High Altitude—An Observational Study Using a Handheld Pupillometer

Wilson

Edsell

Imray³

et al. 2008

High Altitude Medicine & Biology

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Gross pupil dynamics are used as an indirect measure of brain function. Changes in hypoxia and intracranial pressure are thought to alter pupil responses to light. This study assessed a portable handheld pupil measuring device (pupillometer) in the field investigating the changes in pupil size, speed of reaction, and rate of constriction/dilatation with hypoxia induced by changes in altitude. A correlation between pupil dynamics and acute mountain sickness was sought. Seventeen volunteers were studied following acute exposure to 3450 m and then during a trek to 4770 m in Ladakh, India. The pupillometer was used to record maximum and minimum pupil diameter in response to a standard light source with calculation of latency, constriction and dilatation velocities. Acute mountain sickness (AMS) was recorded using Lake Louise self completed questionnaires both in the morning and afternoon on each day. Acute altitude exposure resulted in a significant reduction of percentage change in pupil size (36.5% to 24.1% p=<0.001), significant delay in pupillary contraction (latency; 0.208 to 0.223 seconds p=0.015) and a significant slowing of the rate of contraction (constriction velocity; -2.77 mm/s to -1.75 mm/s p=0.012). These changes reverted to normal during a period of acclimatization. A significant diurnal variation in pupil size was also observed. There was no significant difference between subjects with and without AMS. The handheld pupillometer is a suitable robust tool for monitoring changes in pupil dynamics in the field. With acute exposure to hypobaric hypoxia associated with an ascent to a moderate altitude, there is a general slowing of pupil function which reverts to normal within a few days of acclimatization. There appears to be a marked diurnal variation in pupil size. The measurements clearly demonstrated an effect of hypoxia on cerebral function, but these changes did not relate to moderate AMS.

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“…There is a large variation in the pupil size noted in the literature . This can be due to multiple factors including, but not limited to, age, illumination level, field of illumination, binocular versus uniocular stimulation and autonomic state.…”

Section: Discussionmentioning

confidence: 99%

“…[24][25][26][27][28][29][30] There is a large variation in the pupil size noted in the literature. 10,11,31,32 This can be due to multiple factors including, but not limited to, age, illumination level, field of illumination, binocular versus uniocular stimulation and autonomic state. There have been multiple attempts to create equations to predict the light-adapted pupil size.…”

Section: Discussionmentioning

confidence: 99%

Assessment of bilateral pupillary centroid characteristics at varying illuminations and post‐photopic flash response using an automated pupillometer

Prakash¹,

Srivastava²,

Suhail³

et al. 2016

Clinical and Experimental Optometry

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Comparison of 2 multiple-measurement infrared pupillometers to determine scotopic pupil diameter

Cited by 18 publications

References 20 publications

Comparison of the Colvard, Procyon, and Neuroptics Pupillometers for Measuring Pupil Diameter Under Low Ambient Illumination

Comparison of the Colvard, Procyon, and Neuroptics Pupillometers for Measuring Pupil Diameter Under Low Ambient Illumination

Changes in Pupil Dynamics at High Altitude—An Observational Study Using a Handheld Pupillometer

Assessment of bilateral pupillary centroid characteristics at varying illuminations and post‐photopic flash response using an automated pupillometer

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