How To Use The Lensmeter - Verification of A Complete Bifocal Pair
11:07
YouTubeLaramy-K Optical
How To Use The Lensmeter - Verification of A Complete Bifocal Pair
Learn how to use the lensmeter to read both the distance and near prescription powers of a pair of mounted lined bifocal lenses. This lesson includes reading the lens sphere power, cylinder power, axis and add power. Video highlights how to check a binocular PD and bifocal segment height. The Learn the Lensmeter kits are available for ...
84.3K viewsJun 1, 2017
Bifocals History
135K views · 2.9K reactions | Benjamin Franklin invented bifocals out of diplomatic necessity. | The History Page | Facebook
0:11
135K views · 2.9K reactions | Benjamin Franklin invented bifocals out of diplomatic necessity. | The History Page | Facebook
FacebookThe History Page
59.8K views1 week 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
51K views6 months ago
Benjamin Franklin invented bifocals not for convenience but for high-stakes diplomacy. | History Vault
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Benjamin Franklin invented bifocals not for convenience but for high-stakes diplomacy. | History Vault
FacebookHistory Vault
18.8K views4 months ago
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