Question 1

How accurate are online colour blindness tests?

Accepted Answer

A 2025 study (Gobira et al.) found digital Ishihara tests achieve 96.4% sensitivity and 99.3% specificity compared to physical plates. However, screen calibration, ambient lighting, and Night Mode settings can affect results. Online tests are screening tools — consult an optometrist for a definitive diagnosis.

Question 2

What types of colour blindness does this test detect?

Accepted Answer

OpenColor Labs tests for Protan (red-weak), Deutan (green-weak), and Tritan (blue-yellow) colour vision deficiencies using seven plate types including transformation plates that differentiate protan from deutan.