What is the most common type of color vision testing?

• A. Pseudoisochromatic plates
• B. Anomaloscope
• C. Ishihara color plates
• D. Farnsworth Lantern Test

Answer: (A)

Color vision screening is most effective when using a quick, reliable plate-based test that reveals red–green deficiencies with simple scoring. The most common test used for this purpose is the Ishihara color plates. These plates are a set of pseudoisochromatic plates designed so that people with normal color vision can read a number or see a shape, while many with red–green deficiencies cannot. This format makes screening fast, easy to administer, and widely standardized, which explains why it’s the go-to choice in schools, clinics, and many eye care settings.

Other methods serve different needs: an anomaloscope provides precise, quantitative assessment of color matching and is used in specialized labs; the Farnsworth Lantern Test is tailored for specific occupational color-vision requirements (like aviation); pseudoisochromatic plates is the general category of plate tests, with Ishihara being the most commonly used example.