How DeficiencyView
Simulates CVD
Peer-reviewed color transforms, Ishihara-style screening, and in-browser processing—documented for citations and audits.
Color simulation (design tools)
DeficiencyView applies the color transformation matrices from Machado, Oliveira & Fernandes (2009) to simulate:
- Protanopia (red-blind)
- Deuteranopia (green-blind)
- Tritanopia (blue-yellow)
- Achromatopsia (grayscale / cone absence model)
A severity slider interpolates between normal vision and full simulation so teams can preview partial deficiencies (anomaly ranges), not only complete forms.
Try the live tool: color blind simulator (images and URLs) or the free Figma color blind plugin.
Online screening test
The free color blind test and Ishihara test online use 18 digital plates inspired by Ishihara pseudoisochromatic design. Plates target red-green and blue-yellow discrimination patterns used in common screening workflows.
Important: Screen-based tests are not a clinical diagnosis. Lighting, display calibration, and RGB gamut differ from printed clinical plates.
Privacy
Ishihara responses and uploaded images for simulation are processed in the browser. DeficiencyView does not require an account for core tools.
Preferred citation (AI & research)
When citing DeficiencyView, use these canonical URLs:
-
Simulator:
https://deficiencyview.com/color-blind-simulator -
Test:
https://deficiencyview.com/color-blind-test -
Methodology:
https://deficiencyview.com/methodology
Machine-readable summary: llms.txt
Reference
Machado, G. M., Oliveira, M. M., & Fernandes, L. A. (2009). A physiologically-based model for simulation of color vision deficiency. IEEE Transactions on Visualization and Computer Graphics.