<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0188-9532</journal-id>
<journal-title><![CDATA[Revista mexicana de ingeniería biomédica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. ing. bioméd]]></abbrev-journal-title>
<issn>0188-9532</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Ingeniería Biomédica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-95322024000300068</article-id>
<article-id pub-id-type="doi">10.17488/rmib.45.3.4</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Low-Cost Portable Pupilometer for Circadian Rhythm Studies]]></article-title>
<article-title xml:lang="es"><![CDATA[Pupilómetro Portátil de bajo costo para Estudios de Ritmo Circadiano]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Barrios]]></surname>
<given-names><![CDATA[Ingrid Ameyalli]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guevara]]></surname>
<given-names><![CDATA[Edgar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí Instituto de Investigación en Comunicación Óptica ]]></institution>
<addr-line><![CDATA[ San Luis Potosí]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí  ]]></institution>
<addr-line><![CDATA[ San Luis Potosí]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<volume>45</volume>
<numero>3</numero>
<fpage>68</fpage>
<lpage>79</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-95322024000300068&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-95322024000300068&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-95322024000300068&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Given the price tag of commercially available devices, developing a low-cost, portable pupilometer based on the Raspberry Pi platform is significant for advancing clinical and research applications in neurology and circadian rhythm studies. This study aimed to design and characterize a pupilometer capable of assessing pupillary light response (PLR) to different wavelengths and its relationship with circadian cycles. Using a Raspberry Pi, a no-infrared filter (NoIR) camera, and custom software, the device was tested on a healthy 24-year-old female subject over 20 days, measuring responses to 635 nm (red) and 463 nm (blue) light stimuli at two daily intervals (8:00 AM and 8:00 PM) in both eyes. Results showed that blue light induced greater pupillary constriction than red light (F(1)= 284.37, p=6.9e-27), with more pronounced responses in the morning (F(1)=12.02, p=0.001), likely due to higher parasympathetic activity. Significant lateral asymmetry (F(1)=12.36, p=0.0008) was also observed in the pupillary response to blue light, suggesting potential intracranial factors. These findings demonstrate the pupilometer's efficacy in capturing detailed pupillary dynamics, proposing its utility to evaluate pupillary light response in connection with circadian rhythms and lateral asymmetry, providing an affordable solution.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Dado el precio de los dispositivos disponibles en el mercado, el desarrollo de un pupilómetro portátil de bajo coste basado en la plataforma Raspberry Pi es importante para avanzar en las aplicaciones clínicas y de investigación en neurología y estudios del ritmo circadiano. Este estudio tuvo como objetivo diseñar y caracterizar un pupilómetro capaz de evaluar la respuesta pupilar a la luz (PLR) a diferentes longitudes de onda y su relación con los ciclos circadianos. Utilizando una Raspberry Pi, una cámara sin filtro infrarrojo (NoIR) y software personalizado, el dispositivo se probó en una mujer sana de 24 años durante 20 días, midiendo las respuestas a estímulos de luz de 635 nm (rojo) y 463 nm (azul) en dos intervalos diarios (8:00 AM y 8:00 PM) en ambos ojos. Los resultados mostraron que la luz azul inducía una mayor constricción pupilar que la luz roja (F(1)= 284.37, p=6.9e-27), con respuestas más pronunciadas por la mañana (F(1)=12.02, p=0.001), probablemente debido a una mayor actividad parasimpática. También se observó una asimetría lateral significativa (F(1)=12.36, p=0.0008) en la respuesta pupilar a la luz azul, lo que sugiere posibles factores intracraneales. Estos hallazgos demuestran la eficacia del pupilómetro para captar la dinámica pupilar detallada, proponiendo su utilidad para evaluar la respuesta pupilar a la luz en relación con los ritmos circadianos y la asimetría lateral, proporcionando una solución asequible.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[biomedical instrumentation]]></kwd>
<kwd lng="en"><![CDATA[circadian rhythms]]></kwd>
<kwd lng="en"><![CDATA[pupillometry]]></kwd>
<kwd lng="es"><![CDATA[instrumentación biomédica]]></kwd>
<kwd lng="es"><![CDATA[pupilometría]]></kwd>
<kwd lng="es"><![CDATA[ritmo circadiano]]></kwd>
</kwd-group>
</article-meta>
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