Table 4.

 Perception of treatment group assignment versus actual assigned treatment group (week 6 visit)

Patients/parents believed assigned to	Reporting a specific group (%)	Pretty sure or very sure of answer (%)
Patient’s response
Patients assigned to base-in prism reading glasses
Base-in prism reading glasses	35.5	90.9
Placebo reading glasses	3.2	100.0
Patients assigned to placebo reading glasses
Base-in prism reading glasses	23.5	75.0
Placebo reading glasses	14.7	100.0
Parent’s response
Child assigned to base-in prism reading glasses
Base-in prism reading glasses	38.7	91.7
Placebo reading glasses	12.9	75.0
Child assigned to placebo reading glasses
Base-in prism reading glasses	15.2	100.0
Placebo reading glasses	27.3	88.9