FAQs

Color vision deficiency (CVD) is a reduced ability to distinguish certain colors, most commonly red-green. It does not mean seeing no color at all, but rather having trouble telling apart colors such as red vs green or blue vs yellow. It is usually inherited and linked to the X chromosome, so it affects men far more often than women.

Online tests are affected by screen brightness, color temperature, ambient lighting and screen gamut, so they are screening references only and cannot replace a professional medical diagnosis. For confirmation, please visit a hospital ophthalmology department for a standardized color vision exam.

Screening is recommended for: people preparing for a driver license, self-checks before gaokao / civil service / military physical exams, people working in professions with strict color vision requirements (design, art, electrical, pilot), people with a family history of color blindness, and anyone who suspects they may have a color vision deficiency.

The most common types are red-green color blindness (protanopia / deuteranopia), followed by blue-yellow (tritanopia). Complete achromatopsia, where only lightness is perceived, is extremely rare. People with red-green deficiency struggle with red, orange, green and brown; blue-yellow deficiency affects the distinction of blue and yellow.

Congenital color blindness cannot currently be cured, but color-correcting glasses or contact lenses may help in daily color recognition (with limited help on plate tests). Acquired color blindness (caused by eye disease, medication, or injury) may improve when the underlying condition is treated. If your color vision changes suddenly, see a doctor promptly.

Your test records are stored only in your browser (localStorage) and are never uploaded to any server. You can view or clear them at any time on the Records page. The data survives even after clearing browser cache.

It depends on the profession. Color vision deficiency can affect: pilots / flight crew (strict civil aviation physicals), electricians (identifying wire colors), some design / art positions, and chemistry labs (reading indicator color changes). Many careers are not affected. Always check the specific industry standards.

1. Test in a well-lit, even environment; 2. Set screen brightness to a comfortable level; 3. Keep the screen clean, free of fingerprints or dust; 4. Keep a distance of about 40cm; 5. Do not wear tinted glasses or enable night mode; 6. If you wear corrective glasses, keep them on during the test.

Differences in screen gamut (sRGB / DCI-P3 / Adobe RGB), color temperature, brightness and calibration cause colors to render differently. Phones vs monitors and different brands can produce varying results. Retest on the same device several times for a stable result.

No. This platform is an educational screening tool and holds no medical diagnostic qualification. Results cannot serve as official proof for driver licenses, school admission, employment physicals or work permits. For an official report, please visit a qualified medical institution.