Hello
Can a progressive lens be ordered with a prism just in the reading Rx and not in the distance Rx
Thanks
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Hello
Can a progressive lens be ordered with a prism just in the reading Rx and not in the distance Rx
Thanks
If your lab is able to do a slab off they can take a single vision blank create the amount of prism you want. The prism can be oriented in up or down only if you turn it in or out the line would bisect the distance. After creating the slab off prism you would put a free form progressive on the back. A second way would be to take a single vision prism cut it in half and bond it to a free form progressive. You can do the same with a Fresnell prism.
Welcome to OB.Quote:
Originally Posted by Optikaye
As mentioned above, a slab-off prism can sometimes be used to correct prescribed vertical prism at near only, or more commonly, for imbalance at near due to anisometropia. Not possible for prescribed in or out prism on a PAL. Post the Rx and history- all solutions have some degree of undesirable consequences.
For example, we might be able to resolve diplopia, but maybe not asthenopia, by reducing the corridor length, increasing the general purpose eyewear utility, supplying SVNO for the best possible vision/comfort as needed. Numerous other options are available depending on the Rx, VA, usage, etc.
Best regards,
Robert Martellaro
If it's horizontal prism, Kodak used to do it, but they sold out to a company called Neurolen$.
Yup. Kodak called it the "anti-fatigue lens". Base in near only progressive. I used it for a grand total of 1 patient ever.Quote:
Originally Posted by drk
But did it work???? :)
It did actually. It was for the OD that worked for me.