Prescription AnalysisCâu 33 / 100
In the Rx -2.50 -0.75 x 180, what does the 180 represent?
a.The sphere power
b.The axis of the cylinder
c.The add power
d.The prism base
Giải thích
The number after the 'x' is the cylinder axis, expressed 1 to 180 degrees, indicating the orientation of the cylinder correction. Here the axis is 180 degrees.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Transpose the Rx: +2.00 -1.00 x 090 into plus-cylinder form.
- Transpose the Rx: -3.00 +2.00 x 045 into minus-cylinder form.
- 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)?
- When reading an Rx, which value is always a plus number on a bifocal?
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