Optical MathCâu 95 / 100
With a 34 mm effective diameter and 4 mm per-lens decentration, what is the approximate minimum blank size?
a.About 42 mm
b.34 mm
c.30 mm
d.52 mm
Giải thích
A common working rule for minimum blank size is effective diameter + (2 x per-lens decentration). 34 + (2 x 4) = 42 mm, before adding any small manufacturing tolerance.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A -6.00 D lens must produce 3 prism diopters. How far must it be decentered (Prentice's rule)?
- Transpose -1.75 +1.25 x 060 to minus-cylinder form.
- A frame has an A measurement of 52 mm, DBL of 18 mm, and the patient's PD is 62 mm. What is the total decentration for both lenses combined?
- A patient is refracted at a 12 mm vertex with -10.00 D, but the frame sits at 16 mm. Which way does the effective power change, requiring compensation?
- What is the combined horizontal prism when the right lens gives 2 prism diopters base out and the left lens gives 1 prism diopter base out?
- Compute the spherical equivalent of +3.00 -2.00 x 090.
Cập nhật gần nhất: · quy trình kiểm tra
Đội Ngũ Biên Tập PrepPass · Đối chiếu với ABO (American Board of Opticianry) Certified Optician Exam · Quy trình kiểm tra