Thought some of you might be interested in this calculator I developed to determine lens thickness.
Sung S. Kwon
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Thought some of you might be interested in this calculator I developed to determine lens thickness.
Sung S. Kwon
Gotta be kinding me! :-O Undoubtely one of the best I ever seen. Congratulations. I are worth of it.
Very Nice, thanks.
Looks very good. Thank You very much.
But I need you help, why i get results only for minus lenses and plano?
Rafael
Would love to see your calculations, apparently it only is able to open with Excel format, which unfortunately I don't have. Any other way to send it?
Can you open it and and send as an attachment to me in e mail, would that work. Any ideas Opti friends?
Thirsty for knowledge.
specs4you,
you can download and install openoffice which is a free version of the office programs. www.openoffice.org they have a spreadsheet program that will open excel files.
thanks a heap.......have a great day all......Quote:
Originally Posted by HarryChiling
I revised the calculator in response to Rafael's comment. Good point, thanks.Quote:
Originally Posted by Rafael
Thank you again,
if you have time do fix the follow points, it would be great:
a) for minus lenses if i set the ct it calculates acurate,
but if i put the et for plus lenses i get wrong results.
The set edge thickness = the centerthickness.
Would be fine if the programm can calculate the Ct, or even better
the thickess on radius and axis, we can choose.
b) Please check the input for the cylinder, on minus lenses the calculations works only if the cylinder is put in (-) Value.
On plus lenses the calculation with cylinder doesent work, for (+) and for (-) value.
Would be fine if both combinations are possible for the data entry.
Rafael
The formulas calculate the center thickness of the lens for plus lenses.Quote:
Originally Posted by Rafael
Therefore, the Lens Thickness Graph will show you the center thickness
no matter what axis it is.
If you have (+) Sph with (+)Cyl, the program will calculate the
strongest power after transposing. For example, if you selected the Rx =
+3.00 +1.00 x 180, it will calculate the thickness with the power of
+4.00 D and the longest distance from OC.
Hopefully, that helps. Thanks.
Sung
Hi ,
I appreiciate your work. But this index thickness is only pertaining to a 1.5 index right what if the patient wants to know at the higher index's that is 1.67/1.7/1.8 and 1.9 then how can we calculate the thickness value using your calculator.
PSI
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, Trivex(1.532), Spectralite, Alphalite, 1.56 Mid-Index, and Ploycarbonate lenses.Quote:
Originally Posted by PSI
Sung
I was occassionally using this excel for quick calculations and today I tried to run it on a high plus power lens but it would not work. Can someone try this excel on their computer and tell me if they are having the same problem or is it just me?
Thanks in advance,
Doc
thanks very much!
this tool is excellent. I will introduce to my LAB manager.
This is going to be extremely helpful! Thanks!
The program doesn't calculate:Quote:
Originally Posted by kwon0504
in case of plus prescription (the sphere only)
in case of plus cylinder
With Plus lenses it should require to manualy insert the diameter of the lens.
Nice
:smile:Nice