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The accuracy of reflection pupillometers‐‐a preliminary report
Author(s) -
Obstfeld Henri,
Chou B. Ralph
Publication year - 1996
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1046/j.1475-1313.1996.96833680.x
Subject(s) - reflection (computer programming) , standard deviation , reliability (semiconductor) , optometry , optics , mathematics , ophthalmology , power (physics) , computer science , statistics , medicine , physics , quantum mechanics , programming language
There appears to be a measure of agreement about the reliability of corneal reflection pupillometers. However, we have not encountered any publication about the accuracy of these instruments. This is what we set out to investigate. For this purpose we fixed two ball bearings at distances varying from 55 to 70 mm, in 5 mm steps. Ten measurements of the separation of the simulated corneal reflections were taken with a number of reflection pupillometers, by two experienced optometrists. The first five measurements were taken from a maximum, and the remainder from a minimum scale reading. Preliminary results show that interobserver differences in readings were of no practical significance. However, since the average of some readings showed errors of as much as 2 mm, with a standard deviation of 0.35 mm, it is suggested that this source of error is a factor in unexplained cases of non‐tolerance to progressive power lenses.