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Normal range of cambridge low contrast test; a population based study.

Hadi Ostadimoghaddam1, Akbar Fotouhi2, Hassan Hashemi3

  • 1Refractive Error Research Center, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran ; Department of Optometry, Mashhad University of Medical Sciences, Mashhad, Iran.

Journal of Ophthalmic & Vision Research
|July 2, 2014
PubMed
Summary

Contrast sensitivity (CS) is lower in older individuals, females, and those with poorer best-corrected visual acuity (BCVA) or myopia. This study establishes normal CS ranges for the Iranian population.

Keywords:
Cambridge TestContrast SensitivityNormal ValuePopulation Based Study

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Public Health

Background:

  • Contrast sensitivity (CS) is a crucial measure of visual function.
  • Understanding normal CS ranges is essential for diagnosing visual impairments and evaluating treatments.

Purpose of the Study:

  • To establish normative data for contrast sensitivity in a normal Iranian population.
  • To identify factors influencing contrast sensitivity, including age, gender, visual acuity, and refractive error.

Main Methods:

  • A cross-sectional, population-based study involving 2,449 eligible participants in Mashhad, Iran.
  • Contrast sensitivity was measured using the Cambridge low contrast square-wave grating test.
  • Statistical analysis, including multiple linear regression, examined associations between CS and demographic and clinical factors.

Main Results:

  • Mean contrast sensitivity values were determined for right, left, and binocular vision.
  • CS was found to be inversely correlated with older age, female gender, poorer best-corrected visual acuity (BCVA), and higher myopia severity.
  • Significant associations were observed (P<0.001 for all).

Conclusions:

  • The study provides reference ranges for the Cambridge low-contrast grating test in the Iranian population.
  • Findings highlight that CS is reduced in older individuals, myopic subjects, and those with lower BCVA.
  • The data can inform clinical practice and research, including the assessment of refractive surgery outcomes.