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Is Seemax from Nikon also free-form?

I was told there is free-form single vision. Is it true? If so, what are those lenses and why do we need free-form for single vision?

Thanks, Harry.

Thought some of you might be interested in this Optical Calculator that I have developed. I posted one before, but this version has a little bit of more feature for vertical imbalance and slab-off. ...

You can simply check Vertical Imbalance with my Optical Calculator. What you said that Slab-off is applied to the lens with most minus or least plus is correct. However, as many others mentioned, I...

Thanks, Harry

Some of you might be interested in this Optical Calculator that I have developed.

Sung Sik Kwon

A large optical chain store.
Open late~.

M~F: 9:30 am - 9 pm
Sat.: 9:30 am - 6 pm
Sun.: 12 pm - 5 pm

It is still better than West Edmonton Mall store. They open untill 9 am even Saturday.

If you want to calculate lens thickness with a calcultor, you can simply use this formula below, or you can download the Lens Thickness Calcualtor I developed.

Lens Thickness Formula...

Click on the "Lens Material" dropdown box to select the lens material you want to use or check. For high index, I added 1.60, 1.67, 1.70, 1.74, 1.80, and 1.90. It also includes CR39, Crown Glass,...

Very nice. Thanks, Tony.

Sung

The formulas calculate the center thickness of the lens for plus lenses.
Therefore, the Lens Thickness Graph will show you the center thickness
no matter what axis it is.
If you have (+) Sph with...

I revised the calculator in response to Rafael's comment. Good point, thanks.

Thought some of you might be interested in this calculator I developed to determine lens thickness.

Sung S. Kwon

very intriguing... as a mechanical engineer and an optician...

When the number of lenses increase, the number of reflections also increase, both first order and second order. The third order or higher is not considered. One pair of glasses has five different...

The formula I have in mind will determine the number of reflections with greater ease and increase the accuracy of the intensity of reflections.

Thank you for your interest, Harry.
I am wondering if there is a formula that can determine the number of reflections to the eye. When a wearer has clip-ons or inserted lenses with safty glasses...

Thank you, Laurie, but that is not what I have in mind.
I am looking for a formula to calculate the number of reflections. For example, how many reflections a patient may have while wearing a pair...

Is there any formula for the number of reflections? I think I might have come up with a formula that identifies the number of lens reflections to a patient's eye. I am, however, not sure if there is...