Got a question?
Find your answer.

DOA is a Windows desktop application that adjusts your screen display based on your glasses prescription. If you wear glasses and sometimes want to use your computer without them — reading in bed, quick tasks without reaching for your glasses — DOA adjusts the screen to make it readable without them. It is a display accessibility tool, not a medical device.

You need a Windows 10 or 11 PC (64-bit), a graphics card compatible with DirectX 11, at least 4 GB of RAM, and an internet connection for your first sign-in. That's it — no special hardware, nothing to attach to your screen.

Download the installer from the download page, run it, and follow the setup steps. DOA will ask you to create a free account and enter your glasses prescription. First-time setup takes about two minutes. You will get a warning from SmartScreen, so please continue and download the app, it is safe.

Yes, a free account is required. It lets DOA save your prescription profile across devices and keeps track of your daily usage for the free tier. Signing up takes under a minute and only requires an email address — or you can sign in with Google or Apple.

Yes. The free tier gives you 3 hours of use per day, one saved prescription, and access to the color filters. That is enough for most casual daily use. Premium removes all limits and adds multi-monitor support. You can also earn 7 days of Premium free by submitting feedback after a session — see how to get free Premium.

Not yet. Windows 10 and 11 are the only supported platforms right now. macOS and Linux support are on the roadmap, but no release date has been set.

No. DOA is a display accessibility tool — it adjusts what your screen shows. It is not classified or regulated as a medical device anywhere in the world and does not treat, diagnose, or replace professional eye care. If you have concerns about your eyesight, please consult a qualified eye care professional.

DOA uses the standard values from your glasses prescription: SPH (sphere — how strong the lens is), CYL (cylinder — astigmatism strength), AXIS (the direction of the astigmatism), and ADD (the reading addition, for bifocals or reading glasses). These are the same numbers printed on your prescription slip or glasses receipt.

Your optician or optometrist gives you a printed prescription after an eye exam. You can also find it on the sticker on your glasses case, or request a copy from the optician who made your glasses. If you can't find it, your optician is required by law in most countries to provide a copy on request.

DOA works with most standard glasses prescriptions — near-sightedness, far-sightedness, astigmatism, and reading glasses. Very strong prescriptions may see less improvement depending on your screen's resolution and pixel density. High-resolution screens (like 4K monitors) generally give better results at higher prescription strengths. The free tier lets you try it with no commitment.

Currently DOA requires prescription values to set up the display adjustment. If you don't know your prescription, you can request it from your optician. A guided calibration mode that doesn't require a formal prescription is planned for a future version — you can follow updates on the roadmap.

DOA currently applies a single display adjustment to the whole screen. Enter the prescription for your dominant eye, or the values for the eye that you find more uncomfortable when using a screen without glasses. Per-eye adjustment is something we're evaluating for a future update.

Open DOA, go to your prescription profile, and edit the values. Changes apply immediately next time you activate the display adjustment. Free accounts can save one prescription at a time — update it whenever your prescription changes. Premium accounts can save unlimited profiles.

A few things to check. First: are your glasses off? DOA is designed to be used without glasses — if you're wearing them while testing, the screen will look wrong. Take them off, then compare. Second: try the toggle test — switch DOA off and on repeatedly while looking at small text. The difference is easier to spot in comparison than in isolation. Third: very mild prescriptions see a subtler effect, because your eyes already handle close-up screens fairly well. The adjustment is still there — it's just less dramatic. Screen distance is critical. Ensure you are looking at the screen from the distance you set in your prescription card. If none of this helps, contact support and we'll look at your setup.

DOA lives in your system tray (the icon area near your clock). Right click the tray icon to toggle it on or off. You can also use the keyboard shortcut (ctrl + shift + f12) to toggle it instantly without opening anything.

Yes — DOA works at the OS level and applies the display adjustment to everything on your screen simultaneously: browsers, documents, videos, games, and any other application. The only exceptions are certain Windows system elements (login screens, UAC prompts, some banking app windows) that the operating system intentionally protects from screen overlay — these are excluded automatically.

In practice, most users don't notice the delay during everyday activities like reading, writing, browsing, or watching video. It's most likely to be noticeable in fast-paced games or applications where split-second timing matters. For gaming, we recommend keeping DOA off.

The prescription adjustment is focused on sharpness and can introduce slight edge contrast changes, but it does not intentionally alter color rendering. The color filter modes (for color difficulty) do change how colors appear on screen — that's their purpose. If you need accurate color for design or photo editing work, turn DOA off for those tasks.

The color filters are for people who have difficulty distinguishing certain colors — Protanopia (red difficulty), Deuteranopia (red-green difficulty, the most common), and Tritanopia (blue-yellow difficulty). Each filter adjusts the color balance on your screen to make those colors more distinguishable. They work on their own without a prescription, or alongside one.

Multi-monitor support is a Premium feature. With Premium you can apply different display settings to each monitor separately — useful when your screens are at different distances or have different resolutions.

You can, but we don't recommend it for fast-paced games. The 30–50ms overlay delay is imperceptible during normal use but can affect reaction-time-sensitive gameplay. For reading text in slower games or RPGs it's fine. Toggle it off before competitive or fast-paced gaming.

Use DOA with your display adjustment active for at least 60 seconds, then turn it off. A short feedback popup will appear automatically asking a few questions about how the display felt. Submit the feedback and 7 days of Premium are added to your account instantly — no coupon, no card needed. You can do this once every 30 days.

Premium removes all free tier limits: unlimited daily usage (no 3-hour cap), unlimited saved prescription profiles, multi-monitor support, the full color filters suite, no watermark, and priority support. It costs $4.99/month or $39.99/year.

Open the DOA app and go to the Premium section. Payment is handled securely by Creem — you'll be directed to their payment page. Subscriptions are monthly or annual and renew automatically until cancelled. DOA never sees or stores your card details.

You can cancel any time from inside the DOA app under account settings, or by contacting us at support@deviceopticalaid.com. Cancellations take effect at the end of your current billing period — you keep Premium access until then. You won't be charged again after cancelling.

Your account moves to the free tier automatically. Your prescription profiles are saved — you won't lose anything. You'll be limited to 3 hours per day and one active prescription until you resubscribe or earn another free Premium period through feedback.

Yes — contact us within 14 days of your purchase at support@deviceopticalaid.com and we'll review your request. Refunds are assessed individually. Approved refunds go back to your original payment method within 5–10 business days.

You can delete your account from the app settings, or by contacting us at support@deviceopticalaid.com. All personal data is permanently deleted within 30 days of the request. If you have an active subscription, cancel it first to avoid further charges.

No. DOA captures your screen locally in real time to apply the display adjustment, but no frames are recorded, stored, transmitted, or sent anywhere. Every frame is processed on your GPU and discarded immediately after display. DOA has no access to what's on your screen beyond applying the visual adjustment.

DOA collects your email address and account details for authentication, the prescription values you enter, basic device information (Windows version, screen resolution) for compatibility, and session usage duration for free-tier enforcement. Screen content is never collected. See the full Privacy Policy for details.

No. Windows automatically excludes certain protected elements from screen capture — login screens, UAC prompts, and some banking or payment application windows are blocked at the operating system level, not just by DOA's policy. These elements will not appear in the DOA display layer regardless of settings.

Yes. Your prescription values are stored in Firebase (Google Cloud) with encryption at rest and in transit. Access is restricted to your account only — no one else can read your prescription data. You can delete it at any time by deleting your account.

No. DOA does not sell, rent, or share your personal data with any third party for advertising or commercial purposes. The only third-party services used are Firebase (account storage), Creem (payment processing), and Resend (transactional emails). None of them receive your data for their own use.

First check the system tray — the DOA icon should show it's active. Make sure you've saved a prescription profile and it's selected as your active profile. If the values you entered are very mild (close to zero), the change may be subtle. Try toggling DOA off and on while looking at small text to see the difference clearly.

This usually means the prescription values entered don't match your actual prescription well. Double-check your values — particularly that negative and positive signs are correct (myopia values are negative, hyperopia values are positive). Also make sure you're using your glasses prescription, not a contact lens prescription — they are different and not interchangeable.

DOA runs on your GPU and should have minimal impact on most systems. If you're experiencing slowdowns, make sure your graphics drivers are up to date, and that no other GPU-intensive application is running at the same time. On very old or low-end graphics hardware the performance impact may be more noticeable.

Restart the app from the system tray or from your Start menu. If crashes happen repeatedly, make sure your Windows and graphics drivers are up to date. If the issue persists, contact support with a description of what you were doing when it crashed — this helps us fix it quickly.

The feedback popup only appears after you've used DOA for at least 60 continuous seconds with the display adjustment active. If the session was shorter than that, no popup will appear. Also, the popup only shows once per 30-day period per prescription profile — if you already submitted feedback recently, the next popup will appear after the cooldown.

Premium is added automatically within a few seconds of submitting feedback. Try refreshing the app. If it still doesn't show after a minute, contact support with your account email and we'll sort it out manually.

Windows SmartScreen may show a warning for new applications that haven't yet built up enough download history — this is normal for new software. DOA is safe to install. Click "More info" then "Run anyway" to proceed. If you're uncertain, you can verify the file using Windows Defender before running it.