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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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Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
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Colour vision requirements in visually demanding occupations.

J L Barbur1, M Rodriguez-Carmona1

  • 1Applied Vision Research Centre, School of Health Sciences, City, University of London, Northampton Square, London EC1V 0HB, UK.

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|March 24, 2017
PubMed
Summary

Current color vision tests unfairly disqualify individuals with anomalous trichromacy from jobs. This study proposes a new, graded color vision grading system to ensure fair employment for those with functional color vision capabilities.

Keywords:
CAD testIshihara plates testRayleigh matchacquired colour deficiencycolour visioncongenital colour deficiency

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Area of Science:

  • Ophthalmology
  • Occupational Health
  • Visual Science

Background:

  • Normal trichromatic color vision (CV) is a common employment requirement for visually demanding roles.
  • Existing CV tests may unfairly exclude individuals with anomalous trichromacy who possess adequate functional vision.
  • This can lead to discrimination against qualified applicants in fields like aviation and transportation.

Purpose of the Study:

  • To develop a more equitable and accurate system for assessing color vision in occupational settings.
  • To create a graded system of CV categories based on objective data and functional task requirements.
  • To reduce unfair discrimination against individuals with congenital anomalous trichromacy.

Main Methods:

  • Analysis of color assessment outcomes from 1363 subjects.
  • Quantification of the severity of color vision loss in each participant.
  • Establishment of statistical pass/fail criteria for conventional CV tests and protocols.

Main Results:

  • A new six-category color vision grading system was developed.
  • The system ranges from 'supernormal' to 'severe color deficiency'.
  • A single assessment test can determine an applicant's CV category.

Conclusions:

  • The proposed graded CV system offers a more justifiable and equitable approach to occupational screening.
  • It allows for tailored CV requirements specific to the demands of different occupations.
  • This system aims to ensure individuals with functional color vision are not unfairly excluded from employment.