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What Is Color Blindness?

More appropriately “color vision deficiency” is the inability to distinguish between certain shades of color.  Very few people are completely color blind.  Approximately 1 in 12 males and 1 in 200 females have some degree of color vision deficiency.  Color blindness is a condition in which the retinal cone cells respond to light differently than normal.  People with color blindness can usually still see certain colors, but have color confusions or see certain pairs of colors so similarly that they cannot tell them apart. Lentz Eye Care & Associates can make an accurate diagnosis of your color vision defect.  The H.R.R. Pseudoisochromatic Plates test is performed on all patients as a screening tool to identify any color deficiencies they may have.  If a color deficiency is found a ColorDX CCT Color Vision Test (cone-isolation contrast test) will be administered to provide a detailed assessment (with a numeric score) of each cone-cell (or type of color deficiency Red-Green / Blue-Yellow) population.  The ColorDX CCT is a state-of-the-art system to assess color vision deficiencies in high-definition. 


Lentz Eye Care is excited to be one of the only retailers in Kansas to offer EnChroma Glasses. EnChroma unlocks a new world of color for people with color blindness. EnChroma glasses are engineered to make you look good, too, so you can make them a seamless part of your everyday routine.

People with color blindness perceive color differently than people with normal color vision. Rather than receiving distinct visual information from the cone cells in their eyes, they receive overlapping signals, which can cause difficulty in seeing or distinguishing between certain colors. For instance, shades of red, brown, and green can look confusingly similar.

Enchroma lenses are based on an advanced light filtration technology that makes certain colors along the visible spectrum more distinct. By refining the light before it reaches the eye, the eyes can receive the color information they need to communicate the correct signals to the brain. 


ADDRESSING THE PROBLEM The underlying cause of most color vision deficiencies is due to the red and green-sensitive retinal cone cells having an overlapping  response to light. Instead of responding separately to each wavelength of light, their response is highly similar. To compensate for  the overlap, the EnChroma lens contains proprietary optical materials that selectively remove particular wavelengths of light  exactly where the overlap is occurring.


There are different types of color blindness depending on which cone cells are affected. If the red-light cells are affected that is called a
protan-type. If the green-light cells are affected it is a deutan-type. If the blue-light cells are affected it is a tritan-type. Each type can
be mild, moderate or strong. Simulated images of color blindness (as shown below) can give us some insight into how the color
blind eye sees differently.

Color Vision Balloons

Color Blindness & EnChroma Facts

  • There are an estimated 300 million people in the world with color vision deficiency.
  • 1 in 12 men are color blind (8%).
  • 1 in 200 women are color blind (0.5%).
  • Color blindness is typically inherited genetically and carried recessively on the X chromosome.
  • While color blindness is often considered a mild disability, studies estimate that two-thirds of people with CVD feel it’s a handicap.
  • Red-green color blindness doesn’t mean only color confusion with red and green colors, but the whole color spectrum can cause confusion.
  • Enchroma glasses are the only specialty eyewear that alleviates red-green color blindness, enhancing colors without the compromise of color accuracy.
  • Enchroma started in 2010, after ten years of R&D.
  • Enchroma emerged from three National Institutes of Health (NIH) SBIR funded studies on the feasibility of correcting color vision deficiency.
  • A father can’t pass his red-green color blindness on to his sons.
  • If a woman is red-green color blind, all her sons will also be color blind.
  • John Dalton wrote the first scientific paper on color blindness. Color blindness is also referred to as Daltonism.
  • It’s extremely rare, but it’s possible to have normal color vision in one eye and color blindness in the other eye. This is called unilateral dichromacy.
  • The popular “red means bad and green means good” is a poor design for people with color blindness. A better choice would to use red–blue and yellow–blue color combinations.
  • Many people with color blindness cannot tell that the power connector on a MacBook changes color.
  • Lots of color blind people are surprised to find out that peanut butter is not green.


According to genetic population statistics it is estimated that 4 out of 5 cases are forms of partial color blindness (also called anomalous trichromacy) which are addressable using the EnChroma optical lens technology.

To find out if EnChroma glasses can help with your color vision deficiency please contact Lentz Eye Care today or take our online Color Blindness test below.