VertexLensCalc. - Eye Prescription - Eyeglass to contact lens prescription converter

Most people don't know that a glasses prescription can't be used directly for contact lenses. The difference in vertex distance changes the effective power — and getting it wrong means blurry vision or eye strain. Vertex Lens Calc does the math instantly. Enter your glasses Rx, get the corrected contact lens prescription. No sign-up, no ads, completely free. Built for patients who want to understand their own prescription before seeing their optician.

Hey Product Hunt! 👋 I built Vertex Lens Calc after noticing a gap that frustrated a lot of people: when you try to order contact lenses online, your glasses prescription doesn't directly transfer. There's a physics concept called vertex distance — the gap between the lens and your eye — that changes the effective power of your prescription. Most people have no idea this exists. Opticians adjust for it automatically, but if you're trying to understand your own prescription or cross-check what you've been given, there's no simple free tool to do it. So I built one. No accounts, no paywalls, no fluff — just enter your glasses Rx and get your contact lens prescription instantly. Would love to hear feedback from anyone in the eye care space or anyone who's ever been confused by their own prescription. 🙏

VertexLensCalc. - Eye Prescription - Eyeglass to contact lens prescription converter

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