by Peter Kuempel
(Boulder, Colorado, USA)
Q: Does anybody produce a trifocal lens, in plastic, transition type, with the middle section of the trifocal being 10 mm, not 7-8?
The standard dimension of the middle and close vision part together is 28 mm. From this , the 8 mm is the middle section.
Modifying this means to ask for a custom made lens, which I think is hard to find and expensive.
I personally don't know which company makes custom made lenses, I think is hard to change the standard dimensions, but instead, I think you will find this article
interesting and maybe you can find here what you are looking for. Look for the "occupational trifocal lenses".
Hope this helps,