Abstract
Background:Pupillometers have been proposed as clinical assessment tools. We compared two pupillometers to assess measurement agreement.Materials & methods:We enrolled 30 subjects and simultaneously measured the pupil diameter and light reflex amplitude with an iPhone pupillometer and a portable infrared pupillometer. We then enrolled 40 additional subjects and made serial measurements with each device.Results:Failure occurred in 30% of attempts made with the iPhone pupillometer compared with 4% of attempts made with the infrared pupillometer (Fisher’s exact p = 0.0001). Method comparison of the two devices used simultaneously showed significant disagreement in dynamic measurements.Conclusion:The iPhone pupillometer had poor repeatability and suggests that it is not a practical tool to support clinical decisions.
Highlights
Pupillometers have been proposed as clinical assessment tools
Accurate portable instruments are recommended for ease of use and convenience
Infrared portable pupillometers have been in use for over 20 years and have been tested for accuracy
Summary
Pupillometers have been proposed as clinical assessment tools. We compared two pupillometers to assess measurement agreement. Materials & methods: We enrolled 30 subjects and simultaneously measured the pupil diameter and light reflex amplitude with an iPhone pupillometer and a portable infrared pupillometer. We enrolled 40 additional subjects and made serial measurements with each device. Results: Failure occurred in 30% of attempts made with the iPhone pupillometer compared with 4% of attempts made with the infrared pupillometer (Fisher’s exact p = 0.0001). Method comparison of the two devices used simultaneously showed significant disagreement in dynamic measurements. Conclusion: The iPhone pupillometer had poor repeatability and suggests that it is not a practical tool to support clinical decisions
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