Dispensing第 58 / 100 题
Which lens material is required for a child's everyday eyewear for safety reasons?
a.Crown glass
b.CR-39
c.1.74 high-index
d.Polycarbonate or Trivex
解析
Impact-resistant materials such as polycarbonate or Trivex are strongly recommended for children because of their superior shatter resistance, protecting the eyes from injury during active play.
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