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  1. Color blindness - Wikipedia

    Color blindness is any deviation of color vision from normal trichromatic color vision (often as defined by the standard observer) that produces a reduced gamut.

  2. Color Blind Test (#1 Free Color Blind Test)

    Take the top-rated online color blindness test at ColorBlindnessTest.org. Detect color vision deficiency and find out if you're color blind in under 2 minutes!

  3. Color Blindness - National Eye Institute

    Dec 10, 2024 · If you have color blindness, it means you see colors differently than most people. Most of the time, color blindness makes it hard to tell the difference between certain colors. …

  4. Color Blindness: What It Is, Types & Causes - Cleveland Clinic

    Sep 11, 2025 · Color blindness (color vision deficiency) happens because special nerve cells in your retinas are missing or don’t work properly. This makes you see some colors differently …

  5. Color blindness - Symptoms and causes - Mayo Clinic

    Jan 10, 2025 · Color blindness is an eye condition in which someone can't see the difference between certain colors. Though many people commonly use the term "color blind" for this …

  6. Color Blindness: How It Happens and What Causes It - WebMD

    Jul 30, 2025 · Color blindness means your eye doesn't see color the way it should. Your eyes see differences in the light that comes in. It’s a bit like the way we hear sounds as being low or high.

  7. Types of Color Blindness - All About Vision

    Feb 23, 2021 · What causes the seven types of color blindness and what can be done to help individuals see colors more effectively?

  8. Color vision deficiency - AOA

    Color vision deficiency is the inability to distinguish certain shades of color. The term "color blindness" is also used to describe this visual condition, but very few people are completely …

  9. What Is Color Blindness? Condition and Types Explained

    Oct 18, 2025 · Color blindness is when you can't tell the difference between certain colors, like red and green. There is no cure for color blindness, but special glasses or smartphone apps can …

  10. Color Blindness: Types, Causes, and Tests - Vision Center

    Jun 13, 2025 · In this article, we’ll discuss everything you need to know about color blindness and how to get tested. What is Color Blindness? Color blindness causes you to see colors …