It must be over 10 years ago since I trialled a number of handheld autorefractors for use in a school screening programme. Two findings became immediately apparent. Firstly, the instrument with the longer working distance (at that time it was the Welch Allyn SureSight) showed the best repeatability for individual children as they seemed more relaxed by the positioning. Also, those instruments capable of a binocular assessment were less likely to show anisometropic error due to accommodative changes, and might also be useful in detecting reflex differences that might betray underlying binocular fixation differences.
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