Does an iPad fixation disparity test give equivalent results to the Mallett near fixation disparity test?

ABSTRACT:

Background

Various instruments have been developed to measure aligning prism, the prism that eliminates a fixation disparity (associated heterophoria). This includes the established Mallett near vision unit and recently developed Thomson Vision Toolbox on the iPad. With no previous research investigating the agreement between these instruments, practitioners may question if they can be used interchangeably.

Methods

80 participants underwent near vision testing with the Mallett unit and iPad fixation disparity test. Data were analysed in four ways to investigate the agreement of the two instruments.

Results

Many participants reported no fixation disparity (horizontally 46.25%, vertically 82.5%), or non-significant aligning prism (horizontally 70%, vertically 97.5%), on

SUBMITTER: Parmar KR 

PROVIDER: S-EPMC6978586 | biostudies-literature | 2019 Oct - Dec

REPOSITORIES: biostudies-literature