Prescription AnalysisCâu 37 / 100
When reading an Rx, which value is always a plus number on a bifocal?
a.The sphere
b.The axis
c.The add
d.The cylinder
Giải thích
The add power on a multifocal is always additional plus power for near vision, so it is written as a positive value regardless of the distance prescription.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A patient has Rx OD -1.00 DS. What does 'DS' indicate?
- Per ANSI Z80.1 tolerances, verifying a finished single-vision lens checks that the measured power falls within what?
- A lens is decentered 4 mm from the optical center for a +5.00 D lens. How much prism results (Prentice's rule)?
- Segment height is best defined as what?
- Monocular PD is measured from what to what?
- A binocular distance PD of 64 mm typically corresponds to what near PD range?
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