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2. Pupillary distance - Wikipedia

   en.wikipedia.org/wiki/Pupillary_distance

   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.

3. Pupilometer - Wikipedia

   en.wikipedia.org/wiki/Pupilometer

   Since these instruments do not measure any actual pupil parameters (e.g., size, symmetry, reflex, etc.), they do not fall under the medical device definition of a pupillometer. [1] In addition to having PD measured in a retail setting, a variety of web and mobile (Android and iOS) apps are now widely available. Web apps are used by a variety of ...

4. Pupillometry - Wikipedia

   en.wikipedia.org/wiki/Pupillometry

   With an automated pupillometer, the Neurological Pupil index (NPi) and Quantitative Pupillometry Index (QPi) can measure pupillary reactivity and provide a numerical value. It provides objective data and can detect subtle changes that might not be apparent to the naked eye. Its quantitative nature provides objective and more reliable assessment.

5. List of optometric abbreviations - Wikipedia

   en.wikipedia.org/wiki/List_of_optometric...

   PD Pupillary distance PERRLA Pupils equal, round, reactive to light and accommodation PH Pinhole see Pinhole occluder and Visual_acuity#Legal_definitions: PHNI Pinhole No Improvement see Pinhole occluder and Visual_acuity#Legal_definitions: PHVA Pinhole Visual Acuity: PL Perception of light POH / PrOH Previous ocular history PPA Peri-papillary ...

6. Neurological pupil index - Wikipedia

   en.wikipedia.org/wiki/Neurological_Pupil_Index

   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 ...

7. Eyeglass prescription - Wikipedia

   en.wikipedia.org/wiki/Eyeglass_prescription

   PD or IPD Pupillary Distance or Interpupillary Distance, respectively. It is the distance between pupil centers. BVD Back vertex distance is the distance between the back of the spectacle lens and the front of the cornea (the front surface of the eye). This is significant in higher prescriptions (usually beyond ±4.00D) as slight changes in the ...