Vision Deficiency Simulator
See any page the way people with color blindness, low vision, or cataracts experience it, live in your browser.
Select Condition
What Each Filter Simulates
Protanopia
Red-blindness: the red-sensing cones are missing. Reds look darker and can be confused with black or green.
Deuteranopia
Green-blindness: the green-sensing cones are missing. Green deficiencies are the most common kind of color blindness, and reds and greens are hard to tell apart.
Tritanopia
Blue-blindness: a rare condition in which blues and yellows are hard to tell apart.
Achromatopsia
Total color blindness (monochromacy): the world is seen only in shades of grey.
Cataracts
Clouding of the eye's lens that blurs vision, reduces contrast, and causes glare sensitivity. It is common with age.
Glaucoma (Tunnel Vision)
Progressive loss of peripheral vision, leaving only a narrow central field of view.
Pro Tip
Simulating what users see is only half the picture: issues like missing alt text and keyboard traps live in the code, invisible here. Check your color contrast automatically, then run a free accessibility scan to catch the rest.