What is the Cause of Color Blindness?

Color Blindness  Treatment Stockton, CAIf you have some degree of color blindness, you can usually thank your parents. Color blindness is usually hereditary — red/green and blue color blindness is usually passed down from your parents. The gene responsible for the condition is carried on the X chromosome; this is why color blindness affects men far more than women. Color blindness usually means that you have trouble seeing red, green, or blue, or a mix of these colors. It is rare that a person sees no color at all.

There is no treatment for color blindness, but at Central Valley Eye Medical Group, we do test for it during your routine eye exams. We do this not to necessarily test for inherited color blindness, but because most eye diseases can cause it as well.


Around 8% of the males in the world are color blind. That comes to around 250 million people worldwide. The vast majority of those who are color blind have inherited the condition from their mother, who is not color blind herself but is a carrier. Some people can become color blind due to long-term diseases such as diabetes, multiple sclerosis, liver disease, and almost all eye diseases.

Anatomy of color blindness

If your color blindness is inherited, your condition will stay the same throughout your life. It won’t get better or worse, and there is no treatment for it.

The retina of the eye has two types of light-sensitive cells — rods and cones. Both are located on the retina, the layer on the back of the eye that is responsible for processing the images that enter the eye through the lens. Rods are responsible for seeing in low light conditions and at night. Cones work in daylight and have the job of color discrimination.

You have three types of cone cells, each sensitive to different light wavelengths — one perceives blue, another green, and a third red. When light enters the eye, it stimulates the cone cells and the brain then interprets the signals so that you see the color of the object. Stimulate the red and blue cones simultaneously and you see purple.

While the exact cause of color blindness isn’t known, it is believed there are two causes. Either the cones are faulty, or there is a flaw in the pathway from the cone to the brain. Most people with color blindness can’t distinguish certain shades of red and green.

If you are having trouble with color, but previously were not, you need to call us at Central Valley Eye Medical, as that can be a sign of an eye disease. Call us at (800) 244-9907 to make your appointment.

Posted in: Eye Conditions


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Dear Friends,

We at Central Valley Eye hope you and your families are well. During these uncertain times, we are taking all necessary precautions to keep patients and staff healthy as COVID-19 infections continue to rise. We are following CDC and American Academy of Ophthalmology guidelines, including extra diligent cleaning, and disinfecting around the office. Our waiting rooms have been reconfigured to allow more distance between chairs, and we are turning away all non-urgent patients who are symptomatic with cough or fever.

In keeping with government and institutional guidelines, as well as to promote the practice of "staying at home," we are implementing new restrictions. Starting March 20th, we will be limiting our clinic only to patients with eye conditions that could permanently threaten vision if not addressed within two months. This means that many appointments will need to be rescheduled. Additionally, some of our office locations may be closed on certain days, as patient volumes are expected to decrease significantly. If you are unsure whether to come in for your visit, please call us.

The clinic is also establishing a telemedicine service to address eye problems that are less urgent, which can be managed over the phone by a physician.

The doctors at Central Valley Eye will not be performing any non-urgent surgeries until further notice. Our surgery coordinators will be contacting patients to reschedule the surgeries that need to be postponed.

If you have any questions, please do not hesitate to contact us at 209-952-3700.

Warmest regards,

Brandy Simpson
Practice Manager
Central Valley Eye Medical Group, Inc.