Distance without correction | Near without correction | Distance with correction | Near with correction | ||

Primary gaze angle measurements (ICC) | Horizontal | 1.00 (n=47) | 1.00 (n=61) | 1.00 (n=26) | 1.00 (n=34) |

Vertical | 0.98 (n=19) | 1.00 (n=15) | 0.98 (n=13) | 0.98 (n=12) | |

Motility disease categorisation (kappa) | Horizontal | 0.98 (n=54) | 1.00 (n=69) | 0.96 (n=31) | 0.97 (n=36) |

Vertical | 1.00 (n=54) | 0.94 (n=69) | 1.00 (n=31) | 1.00 (n=36) |

Angle measurement agreement is expressed as an intraclass correlation coefficient (ICC), and disease categorisation agreement is expressed as a kappa coefficient. N refers to the number of pairs evaluated.