3. Thresholds for analysis.

Test type categories	Tests included	Output measure	Threshold to extract data
1) Tests which identify ocular misalignment	1.1) Corneal reflections tests: Hirschberg, Krimsky (prism reflection test). 1.2) Fundus reflections test: Brückner.	Prism dioptres (PD).	8 PD for horizontal deviations; 1 PD for vertical deviations (no published threshold identified).
2) Test of binocular function: stereopsis	Stereoacuity tests such as contour and random dot stereotests.	Seconds of arc.	400 seconds of arc.
3) Tests designed to detect reduced ventral vision	3.1) Visual acuity tests, e.g. HOTV, LEA symbols, Keeler (previously Glasgow) crowded logMAR, Sonksen crowded logMAR, crowded Kay picture test. 3.2) Suppression tests. 3.3) Blur test.	LogMAR or logMAR equivalent.	0.2 logMAR.
4) Automated refraction devices designed to report ocular misalignment	‐	Millimetres of asymmetry or corneal reflections.	No published threshold identified.