App for determining stock lenses and cut outs vs. grinders

[FANCYEYE]

Does anyone know of any app that we can download to what lenses we can use, comparatively?

[optical24/7]

The app is on your standard calculator;

eye size + bridge - PD + ED + 1 = minimum blank size.

example;
Frame; 50/20 with ED 53
PD 65

50 + 20 = 70 - 65 = 5 + 53 = 58 + 1 = 59 minimum blank size.

[FANCYEYE]

Much appreciated!! I was looking moreso, for a tool for my co-worker...it's okay, thanks so much!

[King of the Lab]

Much appreciated!! I was looking moreso, for a tool for my co-worker...it's okay, thanks so much!

If he can't do it on paper you can plug it in here.

http://64.50.176.246/tools/blanksize.php

[FANCYEYE]

You are awesome, thanks so much!!

[Lab Insight]

The app is on your standard calculator;

eye size + bridge - PD + ED + 1 = minimum blank size.

example;
Frame; 50/20 with ED 53
PD 65

50 + 20 = 70 - 65 = 5 + 53 = 58 + 1 = 59 minimum blank size.

In theory yes, but theory doesn't always work. The power, frame shape, frame type, and location of the OC in the stock lens is also a factor.

[optical24/7]

In theory yes, but theory doesn't always work. The power, frame shape, frame type, and location of the OC in the stock lens is also a factor.

Like many optical formulas, it’s an approximation formula, but it’s a good starting point for the vast majority.

[Lab Insight]

Like many optical formulas, it’s an approximation formula, but it’s a good starting point for the vast majority.

Exactly. And people scream when it doesn't work as per the theoretical formula.

[PRECISIONLAB]

Minimum blank sizes are considered to be theoretical for two reasons:

1. Two to three millimeters should always be added the the MBS to allow for imperfections such as chips or bubbles which may exist along the periphery of an uncut lens.
   
2. Lens sizes are available from the manufacturers only in certain predetermined sizes, the diameters of which usually range from 60mm - 80 mm in 5-6 mm increments.
   
   At issue for our lab are incorrect ED measurements submitted by ECPs which greatly factor into not only MBS but ideal thickness for plus Rxs.
   
   
   This is a simple explanation of the MBS formula http://visionpreview.com/files/2713/...h_your_Lab.pdf
   

[Kujiradesu]

the app is on your standard calculator;

eye size + bridge - pd + ed + 1 = minimum blank size.

Example;
frame; 50/20 with ed 53
pd 65

50 + 20 = 70 - 65 = 5 + 53 = 58 + 1 = 59 minimum blank size.

lol! (;^o^; )

[Den]

The app is not mine, but i use it frequently.
https://play.google.com/store/apps/d...nesscalculator
You can switch language to English in option named "язык".
And i'm always keeping in mind that any app may not give 100% accurate answer but approximate.
p.s. Hope it will be avaliable in your country.