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Color Vision
Color vision is how well a person can see and distinguish different colors. Testing helps identify color blindness (color deficiency), which means someone may have trouble seeing certain colors correctly.
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How Does Color Vision Work?
The retina in your eye has special cells called cones that detect color. There are three types of cones:
🔴 Red-sensitive cones
🟢 Green-sensitive cones
🔵 Blue-sensitive cones
When these cones don’t work properly, a person may mix up colors or have difficulty seeing shades correctly.
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Types of Color Vision Deficiencies
Red-Green Deficiency (Most Common) – Trouble seeing the difference between reds and greens.
Blue-Yellow Deficiency (Less Common) – Difficulty distinguishing blues from yellows.
Total Color Blindness (Rare!) – Seeing only in shades of gray.
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Why is Color Vision Testing Important?
🔹 In School: Helps identify students who may struggle with color-coded learning materials.
🔹 In Future Careers: Some jobs (like pilots, electricians, and designers) require strong color vision.
🔹 In Daily Life: Helps avoid confusion when reading signs, matching clothes, or cooking food.
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We use special equipment called the Ishihara Pseudoisochromatic Test that shows various images of numbers and lines hidden within different colors. People with different types of color vision deficiencies struggle to see the differences between the colors and are unable to read or trace the images!
How is Color Vision Tested?
