DispensingCâu 71 / 100
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
Giải thích
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.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
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