Engineers at the University of California San Diego have developed a smartphone attachment that could enable people to screen for a variety of neurological conditions, such as Alzheimer's disease and traumatic brain injury, at low cost-;and do so accurately regardless of their skin tone.
The technology, published in Scientific Reports, has the potential to improve the equity and accessibility of neurological screening procedures while making them widely available on all smartphone models.
To enhance the visibility of the pupil, UC San Diego engineers equipped their smartphone attachment with a specialized filter that selectively permits a certain range of light into the camera. That range is called far-red light-;the extreme red end of the visible spectrum located just before infrared light. Melanin, the dark pigment in the iris, absorbs most visible wavelengths of light but reflects longer wavelengths, including far-red light.
Another feature of this technology that makes it more accessible is that it is designed to work on all smartphones. Traditionally, pupil measurements have been performed using infrared cameras, which are only available in high-end smartphone models. Since regular cameras cannot detect infrared light, this traditional approach limits accessibility to those who can afford more expensive smartphones.
The researchers tested their smartphone attachment on a diverse group of 12 volunteers with a wide range of eye colors, from light blue to dark brown. The smartphone measurements were validated against a pupillometer, the gold standard device used in the clinic for measuring pupil size.
Belgique Dernières Nouvelles, Belgique Actualités
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