什麼是 VertexLensCalc. - Eye Prescription？
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.
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