Vertex Distance - OpticianWorks Online Optician Training
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Vertex Distance - OpticianWorks Online Optician Training
May 3, 2017
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Does vertex distance affect lens power or perceived lens power, or is it something entirely different? Either way, how do we calculate the effect it has on someone's vision? | Laramy-K OpticianWorks
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Does vertex distance affect lens power or perceived lens power, o…
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👓📐 VERTEX DISTANCE EFFECT IN HIGH POWER SPECTACLES Why Lens Position Matters! Vertex distance is the distance between the back surface of spectacle lens and the cornea. It plays a major role in high power prescriptions. 🔹 What is Vertex Distance? ✔ Distance from lens to corneal apex ✔ Normally around 12–14 mm ✔ Changes effective lens power when altered. 🔹 When is Vertex Distance Effect Important? 👉 Especially important when power is: • More than ±4.00 D • High minus lenses (myopia) • High p
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