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The problem
Intervention: Surgical correction of horizontal strabismus
Who it was tested with: Children aged 7-10 years with horizontal strabismus requiring surgical correction.
Children or communities are compared with a group that did not receive the intervention, or followed over years. This is the design that best separates what the intervention did from everything else that changed.
"patients between the ages of 7 and 10 years with horizontal strabismus, recommended for surgical correction, were prospectively included. Reading, calculating and drawing abilities were evaluated before and 3 months after corrective strabismus surgery using standardized tests. Cases were compared to control patients: patients with a surgical indication postponed due to the COVID lockdown." This is a case-control design with pre-post measurement and a comparison group to isolate the effect of surgery from natural learning progression.
Short follow-up period of 3 months; control group underwent delayed surgery rather than no intervention; relatively small sample size; single-country study.
Across countries and designs
1 study · 1 country
