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Minimum Detectable Change of Visual Acuity Measurements Using ETDRS Charts (Early Treatment Diabetic Retinopathy Study)

Author

Listed:
  • María Carmen Sánchez-González

    (Department of Physics of Condensed Matter, Optics Area, University of Seville, 41012 Seville, Spain)

  • Raquel García-Oliver

    (Department of Physics of Condensed Matter, Optics Area, University of Seville, 41012 Seville, Spain)

  • José-María Sánchez-González

    (Department of Physics of Condensed Matter, Optics Area, University of Seville, 41012 Seville, Spain)

  • María-José Bautista-Llamas

    (Department of Physics of Condensed Matter, Optics Area, University of Seville, 41012 Seville, Spain)

  • José-Jesús Jiménez-Rejano

    (Physiotherapy Department, Faculty of Nursing, Physiotherapy and Podiatry, University of Seville, 41009 Seville, Spain)

  • Concepción De-Hita-Cantalejo

    (Department of Physics of Condensed Matter, Optics Area, University of Seville, 41012 Seville, Spain)

Abstract

In our work, we determined the value of visual acuity (VA) with ETDRS charts (Early Treatment Diabetic Retinopathy Study). The purpose of the study was to determine the measurement reliabilities, calculating the correlation coefficient interclass (ICC), the value of the error associated with the measure (SEM), and the minimal detectable change (MDC). Forty healthy subjects took part. The mean age was 23.5 ± 3.1 (19 to 26) years. Visual acuities were measured with ETDRS charts (96% ETDRS chart nº 2140) and (10% SLOAN Contrast Eye Test chart nº 2153). The measurements were made (at 4 m) under four conditions: Firstly, photopic conditions with high contrast (HC) and low contrast (LC) and after 15 min of visual rest, mesopic conditions with high and low contrast. Under photopic conditions and high contrast, the ICC = 0.866 and decreased to 0.580 when the luminosity and contrast decreased. The % MDC in the four conditions was always less than 10%. It was minor under photopic conditions and HC (5.83) and maximum in mesopic conditions and LC (9.70). Our results conclude a high reliability of the ETDRS test, which is higher in photopic and high contrast conditions and lower when the luminosity and contrast decreases.

Suggested Citation

  • María Carmen Sánchez-González & Raquel García-Oliver & José-María Sánchez-González & María-José Bautista-Llamas & José-Jesús Jiménez-Rejano & Concepción De-Hita-Cantalejo, 2021. "Minimum Detectable Change of Visual Acuity Measurements Using ETDRS Charts (Early Treatment Diabetic Retinopathy Study)," IJERPH, MDPI, vol. 18(15), pages 1-8, July.
    • Handle: RePEc:gam:jijerp:v:18:y:2021:i:15:p:7876-:d:601041
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