Which of the following is NOT a feature of an ideal accommodative therapy study?

Which of the following is NOT a feature of an ideal accommodative therapy study?

• A. Has a placebo control
• B. Is retrospective
• C. Is prospective
• D. Is double blinded

Answer: (B)

The main idea is that strong evidence in an accommodative therapy study comes from design choices that minimize bias and clarify causality. Retrospective studies look back at data that were already collected, so they’re prone to biases like recall error and confounding—factors that can distort whether any observed improvement is truly due to the therapy. That makes retrospective design unsuitable as a feature of an ideal study. In contrast, a placebo control helps separate the actual treatment effect from placebo responses, a prospective design ensures data are collected forward from the start of therapy to establish temporality, and double-blinding reduces bias from both participants and evaluators. Put together, these elements support reliable conclusions about the therapy’s effectiveness, whereas retrospective designs do not.

The main idea is that strong evidence in an accommodative therapy study comes from design choices that minimize bias and clarify causality. Retrospective studies look back at data that were already collected, so they’re prone to biases like recall error and confounding—factors that can distort whether any observed improvement is truly due to the therapy. That makes retrospective design unsuitable as a feature of an ideal study. In contrast, a placebo control helps separate the actual treatment effect from placebo responses, a prospective design ensures data are collected forward from the start of therapy to establish temporality, and double-blinding reduces bias from both participants and evaluators. Put together, these elements support reliable conclusions about the therapy’s effectiveness, whereas retrospective designs do not.