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ColorDx Specifications

ColorDx Apps
TestsStandard 24, CVTME
Hardware PlatformsiOS, Windows, OSX, Android
ReportingAuto-generated PDF
ColorDx Printed
VersionsStandard 24 | PIP-24, Pediatric CVTME (Color Vision Testing Made Easy)

ColorDx FAQ

Color Vision Deficiency Quick Facts
  • QuickFactsGenetic color deficiencies are about:
    • 8% of males, more common
    • 0.5% of females, less common
  • Most color perception problems are more accurately called Color Deficiency rather than Color Blindness
  • Protan type deficiencies are reduced sensitivity to red
  • Deutan type deficiencies are reduced sensitivity to green
  • Both Protan and Deutan deficiencies confuse red and green colors as being similar
  • Protan and Deutan deficiencies are typically genetically inherited
  • Most color deficiencies see colors, but have some colors that appear the same
  • Tritan type deficiencies are typically acquired and may be more common than genetic types
  • Most printed color vision tests do not test acquired color deficiencies
Examples of how color deficient people see the world.
The vast majority of color deficient persons see the world in color too, but some shades look the same. Some examples of practical colorblindness situations has created some additional examples of how the most common types of color vision deficiencies affect those persons in day-to-day circumstances. Poppies600
How do color vision deficient people cope with their vision?

Closet colorsEach color vision deficient person has their own techniques to cope with their type and severity of color confusions. Here are some examples of methods used by a color vision deficient, color specialist TJ Waggoner:

 

 

  • When approaching a traffic light, don’t assess the color, assess the position
  • When dressing, get someone’s advice on whether the parts of an outfit match well. Consider wearing the “set” instead of randomly mixing and matching
  • When you need to color code something at work or school, pay close attention to the labeled color
  • When cooking food that needs thorough cooking for safety, pay close attention to the time and temperature. A cooking / digital thermometer is very helpful. If you don’t know the time / temperature required, look it up online. When in doubt, ask someone with color normal vision.

Don’t let being color deficient run your life … take it as a challenge and work to overcome through communication, education, and dedication. Several presidents of the United States were color deficient.

Who should be tested for color deficiencies (color blindness)?

classroomChildren:

All children should have their color vision tested before they start school, ideally in pre-school, with the most common issue being genetic deficiencies.

Adults:

Persons who are considering occupations or professions where normal color vision is required to either perform the job or public safety is involved. Examples are pilots (and navigators), air traffic controllers, school bus drivers, some law enforcement personnel, electricians, electronic technicians, railroad conductors, and dental lab technicians. Genetic deficiencies not well screened while young can be a real help to formulating a successful career.  Acquired deficiencies become more common in our adult and senior years.

Female color deficiencies.
Mars and Venus signs, male and female symbol Women can also be color deficient, although genetically only about one-tenth as frequently as men. About 8% of men and 0.5% of women are born with color vision deficiencies. These genetic types are red-green deficiencies and are due to “sex-linked” X chromosomes” and are simple recessive hereditary traits. Men are mainly affected as women have two X chromosomes and men have an X and a Y chromosome. If a man’s one X chromosome is defective, he will be color deficient, whereas a both of a woman’s chromosomes would need to have this trait in order to be colorblind, meaning both her mother (colorblind or a carrier) and father (colorblind). Acquired color deficiencies show no genetic bias.
What type of test should be used for color blindness / color deficiencies?

 

Initial Screening

An initial standard or screening test should be adminstered. We recommend the ColorDx Standard 24 (Waggoner PIP-24).

Extended Test

For persons that fail or have difficulty with the standard test, an extended test should be administered. We recommend the ColorDx Extended 105 (Waggoner CCVT). An extended test provides both qualitative (type: Protan, Deutan, Tritan) and quantitative (severity: mild, moderate, severe) assessment. Both of these tests are also recommended by the Navy for assessment of aviators and other personnel after having undergone rigorous validation.

Can someone who is color normal become color vision deficient?
Fraunfelder, Fraunfelder, Chambers. Clinical Ocular Toxicology. Sanders Elsevier, 2008: 320

Fraunfelder, Fraunfelder, Chambers. Clinical Ocular Toxicology. Sanders Elsevier, 2008: 320

 

Yes, unlke genetic types, acquired color vision deficiencies typically retain some, but reduced, abilities to percieve all colors. This condition is frequently either not screened for or tested with a test series (Ishihara) that is not sensitive to blue-type color deficiencies. Different from genetic types that are quite stable through life, acquired deficiencies vary over time, are conditioned on the cause, and can progress to to severe monchromatic colorblindness.  A person can both genetic and acquired deficiencies. There are broad catagories of condtions that may lead to acquired color deficiencies:

 

  • Trauma
  • Medications
  • Diseases
  • Toxic Chemicals
  • Age

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