Test selector and worksheet
Color Blindness Test: Choose the Right Test and Next Step
Quick answer
Start with the question you need the test to answer.
Start with an Ishihara-style screen for an initial red–green check, or an arrangement exercise when color ordering is your question. Online exercises can guide what to ask next; they cannot diagnose color blindness or certify a job or safety requirement.
Choose your test nowHow to Tell If You Are Colorblind
If you repeatedly struggle to distinguish color pairs that other people identify easily, ask an eye-care professional for a color-vision check. A common first test uses colored dots that form a number, letter, or squiggly line; an online quiz can raise a question, but it cannot settle one when you have concerns. National Eye Institute, NHS
Look for recurring patterns, not one mistake. You may find it hard to sort colored items or tell apart shades that someone else names immediately. A clothing mismatch is an observer's clue, not a self-test: the person choosing the outfit may see the colors differently from the person commenting on it. If red and green labels cause friction but traffic signals remain easy to follow, you may be reading the signal’s position rather than its hue. These examples can help you describe what happens; none can confirm a color-vision deficiency on its own.
In an Ishihara check, some plates act as controls before you interpret harder patterns. A repeatable check begins with a control plate, then records the number or path seen without converting every miss into a diagnosis. Other clinical tests may arrange colored blocks by hue or assess how you match lights; an eye doctor may use additional tests if plate results are unclear. National Eye Institute
Try the online Ishihara test and observation record to record what you see on each plate, then copy, save or share your record without scoring or diagnosis.
What the Older Daltonism Labels Mean
John Dalton is the chemist honored by the name “Daltonism”; he wrote about color-vision differences in himself and his brother, and the 2024 Frontiers in Neuroscience review, “Dyschromatopsia: a comprehensive analysis of mechanisms and cutting-edge treatments for color vision deficiency” uses the term for congenital red–green color blindness.
If your clinician has just said that you have red–green deficiency, you have the form most closely associated with Daltonism; it describes a particular color-vision difference, not every kind, as that review explains.
Your eye doctor may use “color vision deficiency,” the broader term on the National Eye Institute’s “Testing for Color Vision Deficiency” page, which covers trouble seeing certain colors or sometimes no color at all; Daltonism is dated and too narrow as an umbrella label.
If you want to see what an Ishihara plate asks you to identify, try our online Ishihara test and observation record; the UK Maritime and Coastguard Agency’s 2015 “Colour vision assessment for maritime navigational lookout: review for UK Maritime and Coastguard Agency” describes Ishihara as an initial screen for seafarers, with confirmatory testing after a failed screen.
For a hue-ordering practice, try the Farnsworth Munsell 100 Hue exercise; it is not the official physical instrument. A separate tetrachromacy screen color-matching activity is not a color-blindness test and cannot confirm tetrachromacy.
For a shorter screen-based ordering task, the Farnsworth D15 screen exercise uses 15 swatches and reports reversed pairs against its generated sequence.
If colors seem different between your eyes, follow the steps for comparing each eye separately and keep the observations in separate columns.
One published Ishihara protocol uses natural daylight, a viewing distance of 75 centimeters, and a maximum of 3 seconds per plate; those are that protocol’s instructions, not a universal rule for every web quiz. Yonsei Medical Journal study supplement A warm screen filter changes the stimulus, so a result under night mode should not be treated as the same observation as a daylight plate. A missed plate is evidence about that plate, on that display, in that room; it is not a biography of your vision.
An error count can tell you how one test went; a UK government review says Ishihara misses do not reliably grade red-green deficiency severity and that cutoffs are arbitrary. UK Maritime and Coastguard Agency review The National Eye Institute notes that different plates may check for different types of deficiency, and that unclear results may call for other tests. If you have concerns, ask an optician or eye doctor which test fits what you noticed. If the change is sudden or getting worse, seek an eye-care assessment; color-vision deficiency can start at any age, and some cases are acquired. NHS
Does slight color blindness count, and how can severity be judged?
Yes—if an eye-care professional identifies a slight color-vision deficiency, it still counts as a deficiency; a slight color blindness test result or one missed plate cannot establish its severity, because a UK review says Ishihara misses do not reliably grade red-green deficiency severity. One person described the uncertainty this way: “every time I feel like ive developed some trick I am reminded that I in fact do not have a trick”. If you notice a slightly different color distinction or suspect a slight red green color blindness pattern, record the viewing conditions and ask an eye-care professional to interpret a suitable test rather than choosing a severity label yourself.
How did you find out you were colorblind?
They described different starting points, from games and drawing to formal screening; a clue alone does not name a type. An eye-care professional can test color vision during an eye exam. American Association for Pediatric Ophthalmology and Strabismus
One person described a gaming clue this way: “I would lose my cyan crosshair all the time.” That detail names a task and a contrast to discuss, not a diagnosis.
The dated recollections below are individual reports, not clinical measurements or estimates of how common a type is.
| Post date | Anonymous speaker | Number reported | What the number referred to |
|---|---|---|---|
| May 16, 2019 | A commenter recalling a friend | 8 months | Time spent trying to persuade the friend to seek confirmation. |
| November 29, 2019 | A person describing a childhood game | 3 attempts | How many times they mistook a navy-blue stick for black. |
| February 6, 2024 | A respondent describing a game cue | 30 years old | The age they reported when they first noticed the problem. |
Download the printable color-observation comparison sheet (CSV) Open it in a spreadsheet to add rows, then print or save a copy for an eye-care visit.
This sheet is an observation log, not a test. If the person being observed is a child who cannot yet identify the symbols on a test plate, do not use the sheet to infer a type from their responses; share the concern with the child’s eye-care team. AAPOS advises families to raise color-vision concerns with the care team. AAPOS
Choose by goal, not by the most familiar test name
This site’s decision table starts with the decision you need to make. It keeps screening, classification, arrangement, and professional assessment separate so one result is not asked to do another test’s job.
| Your immediate goal | Start here | What this site records or shows | What the result cannot establish |
|---|---|---|---|
| Record responses to a red–green plate screen | Ishihara plate practice | A copyable record of the plates you answered or left unanswered | One screen session cannot diagnose a deficiency or grade its severity |
| Practice blue–yellow plate responses | Blue–yellow C-gap exercise | Your observations on the page's generated blue–yellow figures | This screen exercise is not a clinical blue–yellow test |
| Practice ordering a broad range of hues | Farnsworth Munsell hue exercise | This generated exercise's overall error and tray results | Its screen score is not a result from the standardized physical instrument |
| Try a shorter color-ordering task | Farnsworth D15 screen exercise | Reversed pairs in the page's generated swatch order | It cannot predict whether you will pass a medical or work examination |
| Practice identifying colored shapes | HRR-style screen exercise | Your responses to original, screen-generated shapes | It is not the standardized HRR test and does not diagnose a condition |
| Review a chart, interface, or image for color-only cues | Color blindness simulator | A model-based preview of your image under selected color-vision views | A design preview does not test your own vision |
| Meet a health, job, school, or safety requirement | An eye-care professional or the authority named by that requirement | Ask which accepted test, viewing conditions, and documentation apply to your specific decision | A practice page cannot confirm eligibility or replace the required assessment |
What the common search labels usually point to
“Ishihara color test” and “Ishihara color blind test” usually point to the color-plate route. A search for a “red green color blind test” (also written “red green colorblind test”) generally expresses the same immediate screening goal, while “color blind test free” describes access rather than test scope. The broader phrase “color vision test” can refer to plate, arrangement, or clinician-administered testing, so verify the task before interpreting the result. “Colour vision test” is the British spelling of the same broad phrase.
The National Eye Institute’s testing guide describes color-plate, anomaloscope, and hue testing and advises talking with an eye doctor when color vision deficiency is suspected. A generated screen exercise is available: hrr color vision test.
Preparation worksheet
Copy or print this worksheet before taking an online test. The entries make a repeat run comparable and reveal when a changed condition may explain a changed result.
| Record before testing | Your note |
|---|---|
| Goal: screen, explore a subtype, arrange colors, or meet a requirement | ____________________________ |
| Device and display used | ____________________________ |
| Room lighting and glare | ____________________________ |
| Corrective lenses or display filters active | ____________________________ |
| Test name and source | ____________________________ |
Result-to-action worksheet
Write what happened before choosing a next step. Do not convert an uncertain online result into a diagnosis.
| Observed result | Reasonable next action | Avoid this leap |
|---|---|---|
| Clear result that matches the test’s stated scope | Keep the result with the recorded conditions; confirm professionally if the decision has consequences | Assuming every other test measures the same thing |
| Mixed, borderline, or changing result | Repeat only after standardizing the device, lighting, and test instructions; then consider professional testing | Choosing the most dramatic label from repeated attempts |
| Result needed for an official requirement | Stop and obtain the accepted test and documentation rules from the responsible authority | Submitting an informal online result as proof |
| No concern, but a design still relies on color alone | Use the simulator to inspect the design and add labels, shapes, patterns, or line styles | Treating a personal test result as an accessibility review |
Controlled worked example
A result changes when the environment changes
A person takes the same online plate screen on a laptop in a bright room and later on a phone in a dim room. The answers differ. The controlled response is to choose one device, remove filters, reduce glare, follow the same instructions, and record that setup before repeating; the inference is that the environment is a plausible source of disagreement because the viewing conditions changed while the task did not.
When to move from an online screen to professional assessment
Use professional testing when you or a child may have a color vision deficiency, when an online result is unclear, or when a formal decision depends on the outcome. The National Eye Institute explains that an eye doctor can use a color-plate test and may use other tests when the result is not clear.
Practical inference: if a workplace, school, licensing body, or safety process will rely on the result, ask that authority which test and documentation it accepts. The reasoning chain is that different tests answer different questions, while the authority—not an informal web page—defines the evidence it will recognize.
Source and scope
Clinical test descriptions and the boundary between online screening and eye-care assessment were checked against the National Eye Institute. The goal selector, preparation worksheet, result-to-action table, and worked example are original tools created for this site.