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Related Concept Videos

Color Vision01:24

Color Vision

648
Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Updated: Aug 19, 2025

Subjective Refraction Test Using a Smartphone for Vision Screening
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Published on: October 18, 2024

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Smartphone Color Vision Testing as an Alternative to the Conventional Ishihara Booklet.

Muhammad A Khizer1, Umer Ijaz1, Taimoor A Khan1,2

  • 1Ophthalmology, National University of Medical Sciences, Rawalpindi, PAK.

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|December 2, 2022
PubMed
Summary

Smartphone color vision tests using Android and iOS devices are as accurate as the standard Ishihara booklet. This study validates mobile devices as a convenient alternative for assessing color vision defects.

Keywords:
androidcolor vision deficiencyiphoneishihara platesscreensmartphone

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Area of Science:

  • Ophthalmology and Vision Science
  • Medical Technology and Digital Health

Background:

  • Color vision testing has evolved significantly since the 1700s, with implications for quality of life.
  • Traditional screening tools like Ishihara color plates are widely used but can be less accessible.
  • Smartphones offer a ubiquitous platform for various health applications, including vision testing.

Purpose of the Study:

  • To compare the accuracy of color vision testing using Android and iOS smartphones against the standard Ishihara color plate booklet.
  • To validate the use of mobile applications for accessible color vision screening.

Main Methods:

  • A cross-sectional validation study conducted over six months at the Armed Forces Institute of Ophthalmology, Pakistan.
  • 162 participants aged 12-70 years underwent color vision assessment using Ishihara plates and both Android and iOS smartphones.
  • Data analyzed using IBM SPSS Statistics 25, with a significance level set at p < 0.05.

Main Results:

  • No statistically significant difference was found between smartphone-based color vision tests (Android/iOS) and the Ishihara booklet (p=0.565).
  • The study sample comprised 162 participants, predominantly male (69.14%), with an average age of 35.94 years.
  • The findings indicate that smartphone color vision assessments yield results comparable to standard Ishihara testing.

Conclusions:

  • Smartphone applications provide a viable and accessible alternative for color vision defect screening.
  • Despite challenges in screen standardization, the widespread availability and ease of use of smartphones support their role in vision testing.
  • Further studies should consider smartphone screen variability when evaluating digital vision screening tools.