Last updated: July 2026
This Privacy Policy explains what information Sight Calculator collects, how it is used, and the choices you have. We built this tool to be lightweight and privacy-respecting by design — the eye screening itself runs entirely in your browser and is never sent to a server. Please read on for the full details, including how advertising works on this site.
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Who We Are
Sight Calculator ("we," "us," "our") operates this website, which offers a self-screening visual acuity tool and educational articles about eye health. If you have questions about this policy, see our About & Contact page for how to reach us.
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Information the Screening Tool Collects
The vision screening tool runs locally in your browser. Your answers (which letters or shapes you could or couldn't see) are used only to calculate your on-screen result and are not transmitted to, or stored on, our servers.
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Log Data
Like most websites, our hosting provider may automatically collect standard technical information when you visit, such as your browser type, general device type, referring page, and approximate access times. This is used only in aggregate to keep the site running reliably and is not used to identify you personally.
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Cookies
Cookies are small text files stored on your device. We and our third-party partners (described below) may use cookies and similar technologies (such as web beacons and local storage) to operate the site, remember preferences, and support advertising.
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Advertising and Google AdSense
This site may display advertisements served by Google AdSense and other third-party advertising networks. Google, as a third-party vendor, uses cookies (including the DoubleClick cookie) to serve ads based on your prior visits to this and other websites. Google's use of advertising cookies enables it and its partners to serve ads based on your visit to this site and/or other sites on the Internet.
- You may opt out of personalized advertising by visiting Google's Ads Settings at adssettings.google.com.
- You can also opt out of some third-party vendors' use of cookies for personalized advertising by visiting aboutads.info/choices.
- Third-party vendors, including Google, may show our ads on sites across the internet and may use information (not including your name, address, email address, or telephone number) about your visits to this and other websites to provide advertisements about goods and services of interest to you.
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Analytics
We may use analytics services (such as Google Analytics) to understand how visitors use the site in aggregate — for example, which pages are most read. These services may use cookies and collect information such as your IP address, though such information is processed in a way that does not personally identify you to us.
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Children's Privacy
This site, including its "gamified" screening mode, is intended for general audiences and is not directed at children under 13 for the purpose of collecting personal information. We do not knowingly collect personal information from children. Parents using the gamified screening mode with a child should supervise use of the site.
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No Sale of Personal Data
We do not sell your personal information to third parties. Any data processed by third-party advertising or analytics vendors is governed by those vendors' own privacy policies, linked above.
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Your Choices
You can control cookies through your browser settings, including blocking or deleting them. Doing so may affect how some parts of the site function. You can also use the opt-out tools listed in the Advertising section above at any time.
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Third-Party Links
Our articles may link to external resources, such as health organizations, for further reading. We are not responsible for the privacy practices or content of those external sites, and we encourage you to review their policies separately.
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Changes to This Policy
We may update this Privacy Policy from time to time to reflect changes in our practices or for legal reasons. The "Last updated" date at the top of this page will reflect the most recent revision.
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Contact Us
If you have any questions about this Privacy Policy, please visit our About & Contact page for ways to reach us.