How to Measure Bifocals - Search Videos

How to Measure Your PD (Pupillary Distance) for Glasses at Home | Eyebuydirect

When buying new prescription glasses online, you will need to know your Pupillary Distance (PD) measurement. You might be wondering how to measure your PD, if your prescription doesn’t include it. Eyebuydirect has put this video together to show you how to measure your PD at home with a mirror, and with the help of another person. Timestamps ...

1M viewsJul 12, 2017

Bifocals History

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Benjamin Franklin was one of historys greatest inventors who created bifocals, the lightning rod and swim fins but never patented any of his discoveries. He believed that seeking patents would lead to disputes and bitterness. Instead, Franklin chose to share his inventions freely with the public, aiming to improve life for everyone. His approach reflected a commitment to the free exchange of knowledge and a quiet generosity that favored societal progress over personal gain. | The History Page

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Benjamin Franklin invented bifocals out of diplomatic necessity. #historyfacts #invention #didyouknow | Ancient Records

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Benjamin Franklin invented bifocals not for convenience but for high-stakes diplomacy. | History Vault

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