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Related Experiment Video

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Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Published on: March 29, 2022

Vertical diplopia on downgaze with bifocals.

¹Department of Vision Sciences, Glasgow Caledonian University, Glasgow, Scotland, United Kingdom. gwa@gcal.ac.uk

Optometry and Vision Science : Official Publication of the American Academy of Optometry

|August 4, 2009

Summary

Bifocal "jump" is often perceived as double vision (diplopia) due to leading questions. This study reveals that how questions are phrased significantly impacts patient reports of visual effects with bifocal lenses.

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Area of Science:

Optometry and Vision Science
Ophthalmic Optics
Human Perception

Background:

Bifocal lenses are commonly prescribed to correct presbyopia.
Patients sometimes report a visual phenomenon known as

Purpose of the Study:

To determine if patients experience "jump" or diplopia at the dividing line of bifocal lenses.
To investigate if leading questions influence the perception of bifocal "jump".

Main Methods:

Ten subjects were asked open-ended questions, and ten were asked closed-ended questions about bifocal "jump".
Six types of bifocal lenses and three eye movement conditions were tested.

Main Results:

No effects other than near blur were observed with saccadic eye movements.
Vertical diplopia was frequently reported with round 38 segment bifocals during pursuit movements when open-ended questions were used.
When leading, closed-ended questions were posed, all subjects reported "jump" with 38 segment bifocals and 50% with C28 segment bifocals during pursuit movements.

Conclusions:

Bifocal "jump" is often perceived as diplopia, particularly when subjects are prompted with open-ended questions.
The perception of "jump" and diplopia is influenced by the lens design (e.g., round 38 vs. C28 segments) and questioning technique.
Diplopia, rather than "jump", may be more relevant in understanding patient adaptation to bifocal lenses.