Need to know the distance from her eyes to the cash register (or whatever
else she needs to look at while working).

Cashiers, depending on the distance and angle to the work area, will usually
prefer a very soft design that has a long corridor (the distance from the far to
near vision). Percepta from Sola Optical would be a good choice. Make sure the
fitting cross/seg height is at least 22mm.

Hope this helps

Robert Martellaro
~~~~~~~~~~~~~~~~~~
Optician/Owner
Roberts Optical
robopt@execpc.com
~~~~~~~~~~~~~~~~~~
"Science is a way of trying not to fool yourself."
 - Richard Feynman