Originally Posted by
vfpamp
I think Peepers used the wrong word. The field of view is the same, but the acceptance of the glasses can go down. For instance, certain reflections may be more noticeable with stronger thinnings.
Thinning power is proportional to the add power. The stronger the add power, the more distinct top and bottom are, requiring more prism to equalize.
Prism-thinning for of up to 2 prism diopters goes undetected but 100% of patients reject over 4 prism diopters on thinning.
So, because is such a small add, prism thinning is not required, and thus does not create weird ghosts, increasing the acceptability of the lens as compared to a regular progressive.