Color vision is the ability to perceive the differences in light from various wavelengths independent of their intensity. You have probably heard of rods and cones, but are you aware of the Opsin Gene?
The Opsin gene is a light-sensitive gene that produces unique proteins called opsins, which allow animals and humans to see color. The opsins are held in thousands of special cells in the back of the retina. Each set of opsins is tuned to a specific wavelength of light. Signals from the proteins are interpreted by the brain to allow colors to be seen. If an animal has only two types of opsins, it is considered dichromatic; if there are three sets of opsins, it is deemed to be trichromatic. Humans are trichromatic.
Farnsworth Munsell FM 100 Hue test
In manufacturing, laboratory, or design settings where color is critical, color evaluators must have appropriate color vision. The Farnsworth Munsell FM 100 Hue test offers an easy-to-administer but highly effective method for measuring any individual’s color vision. The FM 100 Hue test has been used by the government and industry for more than 40 years. AATCC provides the Farnsworth Munsell 100-Hue Test.
Color Vision – The Three Anomalies
Normal color vision is called trichromacy. Although types of cones are used to perceive light, if one cone senses light out of alignment, this is known as anomalous trichromacy. People with anomalous trichromacy are color blind to some degree. There are three different types of anomalous conditions, and each depends upon which cone is impacted. Protanomaly is a lowered sensitivity to red light; deuteranomaly is a lowered sensitivity to green light, and tritanomaly is a lowered sensitivity to blue light. Deuteranomaly is the most common color blindness, while tritanomaly is the rarest. People can have reduced sensitivity to multiple light colors. Some people cannot see any color at all. This is called monochromacy.
HRR Standard Pseudoisochromatic test
The HRR (Hardy Rand and Rittler) Standard Pseudoisochromatic Test, is one of the most advanced color vision test available. It can be used for the identification of the type of color defect. It can provide a quick positive classification of normal color vision. . The figures incorporated by the HRR Pseudoisochromatic Plates are independent of language. The HRR Pseudoisochromatic Plate Test supports efficient color deficiency screening.
Please note only medical professionals can provide a diagnosis of colorblindness. The HHR can be used as screening to verify normal color vision. It can be used in conjunction with color discrimination testing, such as the FM100 Hue test, to establish a robust color vision screening protocol.
Join AATCCfor a two-day Introduction to Textile Testing Workshop on September 23-24, 2020. FM100 Color Vision screening and certification is also available for a limited number of registered participants. These activities are for anyone dealing with testing and color on a regular basis and will cover a variety of topics including common test methods, evaluations, machinery, and tools for performing tests, and general best practices. Sign-up today!