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Validation of a New Test for Measuring the Contrast Sensitivity Function (Optopad-CSF) at Near Vision.

Dolores de Fez1, Celia García1, Maria Josefa Luque-Cobija2

  • 1Psychophysics and Visual Perception Group, Department of Optics, Pharmacology and Anatomy, University of Alicante, 03690 San Vicente del Raspeig, Spain.

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Summary

A new iPad-based test, Optopad-CSF, accurately measures near vision contrast sensitivity. It detects age-related changes and cataract-induced vision loss, proving effective for clinical use.

Keywords:
CSV-1000EOptopad ProjectOptopad-CSFachromatic contrast sensitivity functioncataracts

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Medical Technology

Background:

  • Contrast sensitivity (CS) is crucial for visual function.
  • Assessing near vision CS is important for daily activities.
  • Existing tests may have limitations in portability or specific applications.

Purpose of the Study:

  • To develop and validate the iPad-based Optopad-CSF test for near vision contrast sensitivity.
  • To compare Optopad-CSF with a standard distance vision test (CSV-1000E).
  • To establish a range of normality and assess its clinical utility.

Main Methods:

  • A comparative study involving 100 healthy subjects (200 eyes).
  • Evaluation using the Optopad-CSF (near) and CSV-1000E (distance) tests.
  • Analysis of agreement using Index of Contrast Sensitivity (ICS) and Area Under the Curve (AUC).

Main Results:

  • Optopad-CSF showed significant negative correlations between CS and age, and visual acuities.
  • Aged subgroup (over 40) exhibited significantly lower CS compared to the younger subgroup.
  • Optopad-CSF demonstrated a larger AUC than CSV-1000E, with comparable ICS values.
  • Cataract patients showed significantly reduced CS outside the normal range.

Conclusions:

  • Optopad-CSF is a valid and portable system for measuring near vision contrast sensitivity across five spatial frequencies.
  • The test effectively detects age-related decline in contrast sensitivity function (CSF).
  • Optopad-CSF can identify CSF loss in cataracts without a ceiling effect.