Дуохром

Can a simple color-based test help detect nearsightedness or farsightedness?

Duohrom by healthcare4mobile is a specialized vision screening tool that uses the principle of chromatic aberration to help identify signs of myopia (nearsightedness) and hyperopia (farsightedness). Designed as a preliminary assessment instrument, this app leverages the eye's natural inability to focus all wavelengths of light on the same focal plane, making it uniquely effective even for users with color vision deficiencies (color blindness). The test presents letters against two contrasting color backgrounds—typically red and green—and asks the user to judge on which background the letters appear sharper or more blurred. This method provides a lightweight, accessible way to determine whether a professional ophthalmological examination is warranted. The app is suitable for home use, educational institutions, or any setting where a quick, non-invasive vision check is needed.

Key Features and Functional Design

The interface of Duohrom is intentionally minimal and intuitive, reducing cognitive load during the testing process. The app generates randomized test charts for each session, which prevents users from memorizing letter sequences and ensures that repeated tests yield fresh, unbiased results. This randomization is critical for maintaining diagnostic accuracy over multiple uses. Voice command integration enhances navigation by providing spoken prompts and instructions throughout the test. Users can activate or deactivate these voice cues at any time, allowing for hands-free operation—ideal for individuals who cannot hold or move the device, or for those who prefer auditory guidance. The test flow is straightforward: letters appear on two colored fields, and the user indicates which background makes the letters appear clearer. The app then analyzes the responses to detect potential signs of myopia or hyperopia for each eye separately.

Detailed Feature Breakdown

• Chromatic aberration testing — Uses red-green color contrast to detect refractive errors, suitable for users with color blindness.
• Randomized test charts — Generates unique letter sequences each session to prevent memorization and maintain test validity.
• Voice command navigation — Provides hands-free, spoken instructions and prompts for users who cannot touch or move the device.
• Per-eye analysis — Delivers separate results for left and right eyes, indicating signs of myopia or hyperopia after test completion.
• Ad-free experience — No advertisements or interruptions during testing, with all features available through the Turbo version.
• Home and school ready — Designed for self-administration at home or supervised use in educational settings for preliminary vision screening.

How the Duohrom Test Works

The core mechanism relies on the phenomenon of chromatic aberration—the inability of the eye's lens to focus different colors of light at the same point. When a person looks at letters on a red background versus a green background, the eye's focusing system reacts differently based on whether the eye is myopic (red appears sharper) or hyperopic (green appears sharper). The app displays a series of letters on alternating red and green fields, and the user simply selects which background provides the clearest view. After completing the test, the app compiles the data and provides a visual analysis for each eye, highlighting potential refractive errors. This method does not replace a comprehensive eye exam but serves as an effective preliminary screening tool that can alert users to the need for professional consultation.

Download Duohrom Now

Get exclusive access to this innovative vision screening tool today. Limited offer for first-time users—download the mobile app now and take the first step toward understanding your eye health. Don't wait for symptoms to appear; proactive screening can make a difference.

Technical Disclaimer: This application requires an internet connection for initial download and updates. In-app purchases are available for the ad-free Turbo version. Duohrom is intended for preliminary vision screening only and does not substitute for a comprehensive eye examination by a licensed optometrist or ophthalmologist. The app is not a medical device and should not be used for diagnostic or treatment decisions. Age restrictions may apply; parental supervision is recommended for minors. Data usage may apply during updates or voice command functionality. Always consult a healthcare professional for any vision concerns.