Nominal Lens Formula Part 1 - Base Curve

The Nominal Lens Formula
What is the Nominal Lens Formula and what use does it still have in a world of freeform generators and 3D printed lenses? Still a vital concept to understand, in the first of this 4-part series covering the Nominal Lens Formula we talk about the importance of base curve and how it relates to lens power.
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This video lesson is sponsored by Laramy-K Optical
Laramy-K Optical is a digital uncut and coating lab unlike any other. The only exclusively uncut lab in the country; we provide our customers with independent, high-end alternatives to corporate brands. Through craftsmanship, technology, and independent, innovative vendors like Younger, IOT, A&R, and Quantum Innovations we offer our customers the Integrity portfolio of freeform lenses and coatings. Made in the USA, the Integrity brand is not a generic house-brand, but is the absolute best available, designed to give the wearer that “wow!” experience.
In addition to the digital line, we still offer conventional surfacing, including glass. Maintaining traditional equipment gives our customers vastly more flexibility in their dispensing, particularly when it comes to more difficult prescriptions.

[rednova]

Hello! Thank you for such an informative video. at 6:17 I'm confused as to why we are using -1.00 instead of -2.00. Thank you!

[luisgomez]

Hi Laramy, here again listining your interesting theme, now Base Curve Part 1...

[boriquanqueen]

In the first example using Vogel's rule, where does the -1.00 come from? At some point do we half the cylinder power? I'm a bit confused because there were no steps that would indicate how do come up with that -1.00? Please help!

[serenagreenbush]

Thank you for the video! Can you explain why you are halving the cylinder power in the Vogel's rule example? Everything else makes sense except for that.

[erodas]

Thanks as always for the helpful videos. Could you possibly make one explaining how center thickness can negativity impact a final completed pair of glasses (when it doesn't meet tolerance standards)? Thank you!

[rimpisaroj]

Thank you so very much sir plz describe the cross compound lens sir

[वसुधैव-जघ]

Nice video, sir please make a video on contact lens prescription calculation to traile frame lenses

[ARUNKUMAR-ojvz]

Sir In prescription i have -1 sphere and -5 cylinder in right eye and-2 sphere and - 5 cylinder in left eye So what is the power of lense It is below 4 or exceed this Please help

[whimsandworries]

im confused, how do we calculate spherical equivalent?

[xasanhh]

You are amazing teacher I would like to ask you about base curve or front curve
How can I choose if example sph +6.25 cyl _ 150 axis 90
Example sph +8 cyl _2 axis 180
Sph +23 how choose base curve rx after calculate power plz

[vikasmishra]

Sir how we calculate the ct in lens when our spherical value is -2.25 and cyl value -1.75 and addition value 1

[johnf.]

videos are excellent just wish this one moved a little slower

[praveenkumar-rghg]

Dear sir it's humble request to please share your all video in Hindi language dubbed it's very very humble request

[zias]

I enjoy your videos
But what's the reason for these hands???😌

[yunusemrecevlik]

Merhabalar kral benim şu odevlere bı bakar mısın 🇹🇷🇹🇷🇹🇷