Dispensing第 71 / 100 题
For a progressive lens, insufficient seg/fitting height (frame too shallow) causes what problem?
a.Distance blur
b.Too much add power
c.Excess prism
d.Not enough room for the reading zone, cutting off near vision
解析
Progressive corridors need adequate vertical depth; if the frame's B measurement is too small, the reading portion at the bottom is cut off, leaving the wearer with inadequate near vision.
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