Table 1.

Criteria used to define post-operative clinical outcomes as success, partial success or failure 1 year postoperatively in adults undergoing strabismus surgery.

	Success (All criteria must be met)	Partial success (All criteria must be met)	Failure (If any one criterion met)
Angle of deviation by SPCT*	< 10 prism diopters straight ahead distance and near	≤ 15 prism diopters straight ahead distance and near (without prism)	> 15 prism diopters straight ahead distance or near (without prism)
Diplopia / Visual confusion	None or “rare” straight ahead distance and reading	None, “rare” or “sometimes” straight ahead distance and reading.	“Always” or “often” straight ahead distance or reading
Prism	Not allowed	Allowed	Allowed
Bangerter foil / occlusion	Not allowed	Not allowed	Allowed

For classification as success or partial success, all listed criteria had to be met, for classification as failure only one criterion had to be met. If the criteria for more than one outcome group was met, the patient was allocated to the group with the better outcome.

^*SPCT = simultaneous prism cover test.