DispensingCâu 58 / 100
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
Giải thích
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.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
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