Color Blindness Test — Red-Green Dot Plates

What it is

This colour vision test asks you to find a number hidden among coloured dots. Each plate is a circle packed with dots of three sizes; dots whose centre falls inside the number are painted one colour and the rest another. The two colours are matched in brightness, so the number stands out only through hue. People with a red-green colour vision deficiency often struggle to separate pairs like orange and green, and the number fades into the background. The plates are generated by this page every time and are not reproductions of any printed chart. What you get is a screening hint from your own screen, not a diagnosis.

How to use

1. Leave the brightness where you normally have it, and switch off night mode, blue-light filters and any colour correction.
2. Sit in good light, look straight at the screen and pick the number on the first plate.
3. If you cannot see a number, press “Can’t see”. Keys 1 to 9 work too, and 0 means “Can’t see”.
4. After ten plates you get scores for the control, red-green and blue-yellow plates, plus a short interpretation.
5. Open “Answers by plate” to see which ones you missed, and start over with new plates if you like.

How it works

• Set: two control plates (first and last), six red-green plates and two blue-yellow plates for tritan screening.
• Dots: three dot sizes are placed at random inside the circle with no overlaps. Digits come from the tool’s own seven-segment style glyphs, and a dot takes the number colour when its centre lies inside the glyph.
• Colours: red-green plates use orange and green pairs; blue-yellow plates use cyan and lime-green pairs. Number and background have average relative luminance (WCAG formula) within 10% of each other, and each dot’s brightness is varied between 78% and 100% so brightness alone gives nothing away.
• Interpretation (this tool’s own rule, not a validated cut-off): any missed control plate means the result cannot be read; 3 or more missed red-green plates suggests a possible red-green deficiency; otherwise no clear sign is reported. Missing both blue-yellow plates while seeing both controls gets a separate note.

Examples

Control	Red-green	Blue-yellow	What you see
2/2	6/6	2/2	No clear sign
2/2	4/6	2/2	No clear sign
2/2	3/6	2/2	Possible red-green deficiency
1/2	6/6	2/2	Cannot be read; check screen and lighting

Good to know

Monitors and their settings change how the same plate looks, so results can shift between devices. This is a self-check for reference only and does not replace an eye exam. If colour discrimination matters for your job or you are simply unsure, get properly tested at an eye clinic. The screen eye chart test and the hearing frequency tool sit alongside this one.