EnChroma

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Frequently Asked Questions


  • I am color blind, what will the Cx do for me?

    With the EnChroma lens, colors appear brighter and more saturated. People with CVD say that their color discrimination is faster and more accurate, they are able to notice vibrant colors as never before. They are more likely to notice objects that are differentiated against a background based on color (such as a flower against background of leaves), whereas without the lens those objects would have been overlooked.

    In our user trials, people with CVD also noticed that the EnChroma lens helped them to differentiate textures within a single shade of color—for example the pattern of different shades of green on a leaf, or in a complex textures such as a hillside covered in trees may appear to be “less noisy” and more 3d.

  • Is the lens available in Rx?

    Yes! On every product page you can now order your EnChroma Cx color blindness lenses with prescription correction, either online or via an authorized eyecare professional retailer. If you order directly from us we will contact you for your prescription. You will need to provide the information, preferably by a photograph or scan of it in response to our email.

    Prescription range coverage on polycarbonate lens:
    Single Vision: SPH -4 to +2 CYL -6 to +6
    Progressives: SPH -6 to +2 CYL -4 to +4 ADD +3

  • Does vision insurance cover EnChroma glasses?

    Plans vary, contact your insurer to see if EnChroma lenses are covered. Some patients have found insurance only covered it in prescription, and not just plano.

  • Is the Cx lens effective for dichromats?

    No, if the patient has only two cones, or is so severely color blind that they effectively have two cones, EnChroma lenses are ineffective in terms of addressing CVD. This is about 20% of people who are color blind. All will score as “Severe” in the online test. Unfortunately it is not able to severe cases of trichromats, some of whom we can help, from dichromats. We are working on the test but have the 30 day return policy in part for this reason.

    Many dichromats have commented that they saw a different level of sharpness and detail in the world, but without having a red, green, and a blue cone present in the eye the Cx lens is not going to be effective at correcting color blindness.

  • Is the product suitable for children?

    Yes, the current generation of polycarbonate EnChroma Cx lenses are appropriate for use in children, particularly with the pediatric frames.

  • How do I apply for coverage under Federal Flexible Spending Account guidelines?

    You will need a medical professional to certify that “the expenses are a direct result of a medical condition,” and that the expense is to alleviate that condition. The document is here: https://www.fsafeds.com/forms/MedicalNecessity.pdf .

    Many patients have successfully claimed coverage under the U.S. FFSA guidelines, but we of course cannot guarantee it.

  • Can I wear them while using a computer or mobile device?

    Yes, many color blind patients have reported improved color discrimination on computer and mobile devices with the new generation of EnChroma glasses. It is less pronounced than the outdoor performance.

  • Can I use the lens indoors?

    The new EnChroma eyewear responds much better to being worn indoors than the previous generation, though it is still a sunglass so you may find it to dark to wear indoors.

  • I am an eye care professional. How do I carry EnChroma?

    Contact us at crm@enchroma.com and we will have someone get back to you to answer your questions ASAP. You can offer it like most any eyewear product.

  • Can I wear the lens while driving a car?

    Yes, the EnChroma Cx lens is fully compliant with limits on minimum brightness and chromaticity coordinates of traffic signals as defined by American National Standard ANSI Z80.3-2010. They perform well and as a non-polarized lens allow you to better see oil and other slippery surfaces on the road.

    However, according to the European Union CE standard EN 1836:2005+A1:2007, the lens may be considered “not suitable for driving and road use”. We believe the CE fails to anticipate the technological capabilities of the EnChroma lens with the method used to quantify lens performance with respect to traffic signals. We are not going to cripple the effectiveness of the lens to meet this standard, so the answer is that the European Union does not recommend using them for driving for whatever reason.

  • What frame options do I have?

    The lens is available with a selection of EnChroma-branded frames via direct sale from our website or third party frames via eyecare professionals who carry EnChroma.

  • How is EnChroma different from other products for color blindness?

    Previous attempts at addressing color vision deficiency have been based on strongly-tinted red or magenta lenses that can provide a luminance-based “cue” to help someone with CVD to identify certain colors, particularly reds, but at a steep cost to your overall color discrimination abilities. We believe severely diminishing your overall ability to discriminate colors cannot really be considered an effective way to address color vision deficiency and can be incredibly dangerous if used incorrectly. Also they look rather silly looking if worn in public.

    The effect these products take advantage of was first noticed by John Daulton in the late 18th century. The aids, often worn monocularly (e.g., worn only over the non-dominant eye) or haploscopically (e.g., having a different lens in the right vs left eye), essentially work by making one particular color dark in one eye and bright in the other eye. For example, a red-tinted lens causes green to appear very dark. Thus, something which looks dark in the “aided” eye and bright in the unaided eye could be determined, by process of logical deduction, to be identified as green.


    Above Left: Ishihara plate with hidden “2″ that can only be seen if you can differentiate red versus green.
    Right: As seen through a red lens, the “2″ is visible, but it is seen because of its brightness, not the color.
    There are many issues with such aids: 1) since the right and left eye receive different images, the lens interferes with normal depth perception, 2) they don’t provide additional color information, but rather “something else”—someone wearing the lens can pass a color vision test, but not because they are seeing colors, 3) since the lens depends on high-level cognitive functions to identify colors, color perception does not become faster.

    EnChroma is the only optical aid for CVD that enhances the perception of color at the neural-sensory level, and provides the same image to both the right and left eyes.

  • How does the filter cause color enhancement?

    The retinal cone cells in the human eye have a spectral sensitivity that is strongly overlapping. Due to the overlap, some regions of the visible spectrum provide “redundant” information to the cone cells. The EnChroma lens selectively transmits light only in regions of the visible spectrum that contribute the most to color perception.


    Above: The spectral sensitivity of the human retinal cone cells.
    Using a computer-based mathematical model of the human visual system, we are able to design filters that enhance colors for individuals with normal color vision, as well as for those with different types of color vision deficiency.

  • Can the lens be used to take a picture with a camera?

    Sort of. The spectral sensitivity of the pixels in a digital camera are very different from that of the cone cells in the eye. Therefore, taking a picture through the lens is not the same as looking through the lens. The level of color purity when viewed through the lens exceeds the color gamut of display devices and of printing capabilities. Therefore, even if you could take a picture through the lens, there would be no way to reproduce the photo for viewing in a way that would be equivalent to looking through it.

  • Is there clinical trial evidence? How do I know it really works?

    Yes, the EnChroma Cx lens was invented following a multi-phase SBIR grant from the National Eye Institute, a division of the NIH. During the research and development phase, EnChroma conducted internal research to evaluate the eyewear, including clinical studies with individuals with anomalous trichromacy, the most common type of color vision deficiency. These studies were conducted at UC Davis Eye Center and at UC Berkeley School of Optometry. In the clinical studies it was found that the eyewear can significantly improve scores on the Farnsworth D-15 test when administered under a broad-band daylight simulator. More importantly, in real-world evaluations of the product, users have reported an improved ability to notice colored objects such as flowers, to differentiate between shades of colors, and a greater appreciation for the sense of color and its role in visual perception.

  • Do these lenses help people with Dyslexia?

    There is no reason to suspect that these lenses would help with Dyslexia.