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Br J Ophthalmol 89:1318-1323 doi:10.1136/bjo.2005.068197
  • Clinical science
    • Extended reports

Randomised clinical trial of the effectiveness of base-in prism reading glasses versus placebo reading glasses for symptomatic convergence insufficiency in children

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

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