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Related Experiment Videos

Why do we still not know whether refractive error causes headaches? Towards a framework for evidence based practice.

G E Gordon1, E P Chronicle, P Rolan

  • 1Fachochschule Aalen, Gartenstrasse 135, 73430 Aalen, Germany.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|February 28, 2001
PubMed
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Despite common belief, robust evidence linking refractive error to headache causation is scarce. Methodological issues prevent assessing this link, questioning current diagnostic categories and treatment approaches.

Area of Science:

  • Ophthalmology
  • Neurology
  • Evidence-based Medicine

Background:

  • A common clinical assumption posits that correcting refractive errors can alleviate various headaches.
  • However, the scientific basis for this widely held belief among medical and optometric professionals remains largely unsubstantiated.
  • This review critically examines the existing evidence regarding the relationship between refractive error and headache.

Purpose of the Study:

  • To systematically review experimental and clinical evidence on headache causation by refractive error.
  • To identify limitations in current research that hinder the assessment of this relationship.
  • To question the validity of the diagnostic category 'headache associated with refractive error' and propose future research directions.

Main Methods:

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  • Systematic review of available experimental and clinical studies.
  • Critical analysis of the methodological and theoretical limitations of existing research.
  • Identification of key challenges in establishing a causal link between refractive error and headache.

Main Results:

  • Little to no robust evidence supports the claim that correcting refractive error alleviates headache.
  • Four significant methodological and theoretical difficulties were identified in studies to date.
  • These difficulties currently make it impossible to reliably assess the relationship between refractive error and headache.

Conclusions:

  • The current evidence base is insufficient to support the causal link between refractive error and headache.
  • The diagnostic category 'headache associated with refractive error' requires re-evaluation due to lack of supporting evidence.
  • A framework of five research questions is proposed to guide future evidence-based practice in optometry and headache treatment.