Bifocal glasses lenses explained
7:49
YouTubePrecision Optics Eyewear
Bifocal glasses lenses explained
In this video I explain the different types of bi focal lenses. There are different shapes and sizes of bifocal lenses and it's good to familiarize yourself with the options available. The bifocal lenses shown here are: D28 D35 R24 R38 C28 The letter represents the shape of the seg (segment = the small section where the resting area is) I.e D ...
27.2K viewsJun 14, 2021
Bifocals History
Benjamin Franklin invented bifocals out of diplomatic necessity. | The History Page
0:11
Benjamin Franklin invented bifocals out of diplomatic necessity. | The History Page
FacebookThe History Page
59.8K views7 months ago
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
0:16
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
FacebookThe History Page
51.1K views8 months ago
Benjamin Franklin invented bifocals not for convenience but for high-stakes diplomacy. | History Vault
0:17
Benjamin Franklin invented bifocals not for convenience but for high-stakes diplomacy. | History Vault
FacebookHistory Vault
18.8K views6 months ago
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