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PD measurement using an app (PD+ by Zernike) Pupillary distance measurement with iPad app. Binocular PD measurements are done from pupil to pupil while monocular PD measurements are from either right or left pupil to center of the nose bridge. Measurements are typically reported in millimeters.
Many automated pupilometers can also function as a type of pupil response monitor by measuring pupil dilation in response to a visual stimulus.. In ophthalmology, a pupillary response to light is differentiated from a pupillary response to focus (i.e. pupils may constrict on near focus, as with the Argyll Robertson pupil) in the diagnosis of tertiary syphilis.
Then, in 2019, advancements in machine learning have enabled visual spectrum pupillometry using a smartphone. When measuring the pupillary light reflex, it's important to use an opaque eyecup to get accurate results. [7] This is because the measurement can be affected by ambient light.
The Neurological Pupil index, or NPi, is an algorithm developed by NeurOptics, Inc., that removes subjectivity from the pupillary evaluation. A patient's pupil measurement (including variables such as size, latency, constriction velocity, dilation velocity, etc.) is obtained using a pupillometer, and the measurement is compared against a normative model of pupil reaction to light and ...
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Key Takeaways: Sounds above 80 dB can cause hearing damage, and we should limit the exposure to prevent hearing loss. Decibel apps are a convenient way to measure volume fairly accurately with ...
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