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An implementation of Bubble Magnification did not improve the video comprehension of individuals with central vision loss
Author(s) -
Costela Francisco M,
Reeves Stephanie M,
Woods Russell L
Publication year - 2021
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 - 10.1111/opo.12797
Subject(s) - magnification , eye tracking , coherence (philosophical gambling strategy) , gaze , comprehension , computer vision , computer science , artificial intelligence , mathematics , statistics , programming language
Purpose People with central vision loss (CVL) watch television, videos and movies, but often report difficulty and have reduced video comprehension. An approach to assist viewing videos is electronic magnification of the video itself, such as Bubble Magnification. Methods We created a Bubble Magnification technique that displayed a magnified segment around the centre of interest (COI) as determined by the gaze of participants with normal vision. The 15 participants with CVL viewed video clips shown with 2× and 3× Bubble Magnification, and unedited. We measured video comprehension and gaze coherence. Results Video comprehension was significantly worse with both 2× ( p = 0.01) and 3× Bubble Magnification ( p < 0.001) than the unedited video. There was no difference in gaze coherence across conditions ( p ≥ 0.58). This was unexpected because we expected a benefit in both video comprehension and gaze coherence. This initial attempt to implement the Bubble Magnification method had flaws that probably reduced its effectiveness. Conclusions In the future, we propose alternative implementations of Bubble Magnification, such as variable magnification and bubble size. This study is a first step in the development of an intelligent‐magnification approach to providing a vision rehabilitation aid to assist people with CVL.