Frequently Asked Questions

BlindnessTest.com is a free website with browser-based color vision screening tools. It helps you explore possible protan, deutan, and tritan patterns using digital tests inspired by common clinical methods. Start with the Color Blind Test when you are ready to try a test.

CyberRudra Technologies operates BlindnessTest.com. The site launched in February 2023 and is updated based on user feedback and product improvements. Learn more on the About page.

No. The site provides educational screening tools only. It does not replace an in-person exam, prescription advice, or treatment from a licensed eye care professional. Read the full Disclaimer before relying on any result.

Clinical exams use controlled lighting, calibrated equipment, and professional interpretation. Our tools run on your own screen in everyday conditions, so they are useful for awareness and follow-up questions, not for formal diagnosis on their own. The Disclaimer explains these limits in detail.

Yes. You can take the screening tools on the site without payment or sign-up. Optional browser extension downloads are also free through the official Chrome, Edge, Firefox stores.

The site is for anyone curious about their color vision, including students, educators, and people preparing to discuss results with an eye care professional. It is not a substitute for occupational licensing exams unless an employer or regulator explicitly accepts online screening. See the Disclaimer for responsible use.

No. Use the site to learn and screen, then follow up with an optometrist or ophthalmologist when results are unexpected, symptoms change, or you need a diagnosis for work, school, or treatment. Contact us if you need help finding the right next step.

Screening copy and disclaimers are written using established clinical references (NEI, NHS, AAO, and similar sources). A named medical review panel is not published on the site yet. See our About page for how the project is operated.

The site was built to make color vision screening more accessible online. The goal is to help people start an informed conversation about their color vision without downloads, appointments, or sign-up barriers. Try the Color Blind Test to get started.

CyberRudra Technologies develops and operates BlindnessTest.com as a public screening platform. For company inquiries unrelated to the site, visit the Contact page or CyberRudra corporate channels.

No. You can start any screening tool directly in your browser without creating an account or signing in.

The site currently includes Color Blind Test, Ishihara Test, FM 100 Hue Test, Anomaloscope Test, Cambridge Color Test, FALANT Test. Each tool page explains what the test measures and how to interpret your result.

If you are new to color vision screening, the Color Blind Test gives channel scores across common deficiency types. The Ishihara Test suits Kanehara-style red-green plate screening with optional tracing for non-readers. Arrangement tests such as the Farnsworth-Munsell 100 Hue Test add detail when you want a deeper look.

Most tools take a few minutes to complete. Exact length depends on the test and how many steps you finish. Each tool page describes what to expect before you begin.

Yes. The tests run in a modern web browser on desktops, laptops, tablets, and smartphones. For the most consistent display, use good lighting, a clean screen, and follow any on-page instructions.

No app install is required for the website tests. An optional Color Blind Test browser extension is available if you want quick access from Chrome, Edge, Firefox.

Current versions of Chrome, Firefox, Safari, and Edge generally work well. Keep your browser updated, disable aggressive color-altering extensions during a test, and avoid split-screen modes if colors look inconsistent.

People of all ages can use the site, but younger users should have a parent, guardian, or educator guide them. Screening results for children should be discussed with a qualified eye care professional. Read the Disclaimer before use in classroom settings.

Yes. A Color Blind Test browser extension is available for Chrome, Edge, Firefox. Store links are also listed on the Changelog page under Explore.

Yes. The site supports 12 languages: English, German, Spanish, French, Danish, Dutch, Norwegian, Indonesian, Italian, Polish, Portuguese, and Russian. Use the language switcher in the header to change locale without leaving your current page when localization is available for that view. Recent language work is noted on the Changelog page.

No. Online screening can highlight possible color vision differences, but only a qualified professional can confirm a diagnosis and recommend next steps. See the Disclaimer for limitations.

Treat it as a prompt to follow up with an optometrist or ophthalmologist, especially if results are unexpected or you notice everyday color confusion. Contact us if you have questions about a specific test result.

These labels describe common axes of color vision difference. Protan and deutan relate to red-green confusion patterns, while tritan relates to blue-yellow confusion. Your result wording on each tool page explains what was measured in that specific test, such as the Color Blind Test or Cambridge Color Test.

The Color Blind Test scores red, green, and blue channels separately using cone isolation. When the pattern is clear, it suggests protan, deutan, tritan, or normal color vision and may show Mild, Moderate, or Strong on the weakest channel. Normal results show a Typical range badge. An inconclusive pattern means the scores were too close for a type label. See what your cone scores mean on that page for full rules.

The Ishihara Test counts typical answers on screening plates 2 through 21. Seventeen or more suggests normal screening, thirteen or fewer suggests deficiency, and fourteen to sixteen is borderline. Plate 1 is demo only. See what your Ishihara results mean for classification and tracing sections.

No. Online Ishihara screening is for awareness only. Aviation, maritime, and many employers require supervised, edition-specific protocols. Use the Ishihara Test to screen, then complete the formal exam your regulator or employer lists.

Screen brightness, ambient light, display calibration, fatigue, and color filters can affect digital color perception. If results seem inconsistent, repeat the test in stable lighting or discuss them with an eye care professional.

Yes, if conditions were poor the first time. Retake in a well-lit room without night mode, True Tone, or color filters. For the Color Blind Test, set brightness to 100% before you retry. If unexpected results persist, schedule a professional exam.

Yes. Night shift, True Tone, blue-light filters, color-blind accessibility overlays, and some browser extensions can change how test stimuli appear. Turn them off before screening when possible. For the Color Blind Test, also set brightness to 100% because cone isolation plates rely on unadjusted subpixel color.

The site does not require an account to take tests. Results are shown during your session and are not stored as a personal health record on the site. Do not rely on the site to archive results for medical or employment documentation. See Screening Tool Data in the Privacy Policy for details.

Not unless your employer, regulator, or examiner explicitly accepts self-administered online screening. Many occupational and licensing exams require supervised testing with approved equipment. Read the Disclaimer before submitting results anywhere.

The Disclaimer page explains limitations for each screening tool and how the site should be used responsibly.

No. If you need urgent care, contact your doctor or local emergency services. The site is for educational screening and awareness, not emergency diagnosis or treatment.

Yes, when used with appropriate context. Explain that results are screening aids, not clinical diagnoses, and point students to the Disclaimer page before starting. For classroom use limits, also review our Limited License for Personal Use.

State clearly that digital tests depend on screen quality and lighting, that online results are not a formal diagnosis, and that an eye care professional should interpret concerns about real-world color tasks. Share the Disclaimer page as part of the lesson.

Yes. Link to the specific tool page you use, such as the Ishihara Test, and include the Disclaimer page when assigning the activity. Do not present the site as a certified clinical instrument.

The Farnsworth Lantern Test module can illustrate how signal-light identification is screened in aviation, maritime, and railway contexts. It supports learning and discussion but does not replace regulator-approved occupational testing.

You can demonstrate how a test works on a projector or shared screen, but individual results should be taken on each learner's own display when you want personal screening accuracy.

Only if your organization's policy and applicable regulations allow self-administered online screening. Many employers require proctored clinical testing instead. Review the Disclaimer page before using results in hiring decisions.

Yes. Use the Contact page for professional feedback on wording, disclaimers, scoring presentation, or clinical alignment for a specific tool.

Yes. Contact us for partnership inquiries, institutional use questions, or requests to review how a specific test is presented on the site.

We aim to improve keyboard, contrast, and screen reader compatibility over time. If you hit a barrier in a classroom setting, report it through the Contact page with browser and assistive technology details.

Use the Contact page and describe your institution, audience, and how you plan to use the tools. For corporate matters related to CyberRudra Technologies, use the channels listed on the Contact page.

Try a hard refresh, disable aggressive ad or color filters, and confirm your browser is up to date. If the issue continues, contact us with the test name, device, browser, and a short description of what you see.

Check screen brightness, turn off night mode and True Tone, remove color filters, and close overlays such as screen dimmers. For the Color Blind Test, use 100% brightness before retesting. Retest in a neutral lighting environment before reporting a bug.

Refresh the page and restart the test. If the problem repeats, note the step where it stopped, your browser version, and device model, then contact us with those details.

Displays vary in color calibration, brightness, and pixel density. The same test can look slightly different across devices. Use consistent lighting and compare results cautiously across screens.

Some extensions block scripts or alter page rendering. Temporarily disable strict blockers for blindnesstest.com and retry. See Cookies and Similar Technologies for how tracking affects the site. Report persistent issues through the Contact page with the extension names you use.

Send details through the Contact page. Include the page URL, browser, device, steps to reproduce the problem, and screenshots if possible.

We continue to improve accessibility, but not every test interaction may be fully optimized for all assistive setups. Share specific barriers you encounter through the Contact page so we can prioritize fixes.

For website support, email support@blindnesstest.com. Use the Contact page form if you prefer to send a structured message with subject and details.

We read every message and typically reply within 24 to 48 business hours.

Include the test name, page URL, device model, operating system, browser and version, what you expected, what happened instead, and whether color filters or extensions were active. Send everything through the Contact page.

Visit the Changelog page for release notes. Newer versions are listed first, with details on tools, languages, and platform updates.

We release updates when tools, languages, accessibility, or platform fixes are ready. There is no fixed public schedule. The Changelog page reflects shipped work since the February 2023 launch.

Use the Contact page to share ideas, wording feedback, or requests for additional screening modes. User input helps prioritize fixes and product work.

Send a message through the Contact page describing the tool or language you need and how you would use it. We cannot promise a timeline for every request, but feedback informs planning.

Extension updates are distributed through the Chrome, Edge, Firefox stores. Release notes for major site changes that mention the extension appear on the Changelog page.

We review Contact messages, FAQ helpful votes, and recurring support themes when prioritizing fixes, copy changes, and new tool work. Not every suggestion ships, but repeated needs carry more weight.

If you notice a translation issue or want to help improve a locale, contact us with the language, page URL, and suggested wording. Official localization is managed by the product team.

We do not operate a public mailing list for product updates at this time. Check the Changelog page periodically or follow official BlindnessTest.com channels such as X (Twitter) for announcements.

Not at this time. The Contact page is the best way to share feedback directly with the team.

Use the Contact page and quote the sentence or section that needs improvement. You can also reference this FAQs page or the Disclaimer page in your message.