Prescription AnalysisCâu 45 / 100
With-the-rule astigmatism typically has the cylinder axis oriented near what?
a.Axis 45
b.Axis 135
c.Axis 90 in plus cylinder
d.Axis 180 in minus cylinder
Giải thích
With-the-rule astigmatism has the steeper corneal meridian vertical, corrected with minus cylinder axis at or near 180 degrees. This is the most common form of astigmatism.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A -8.00 D lens is moved closer to the eye. Its effective minus power does what?
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- An Rx reads OD +1.50 -0.50 x 090, OS +1.50 -0.50 x 090, Add +2.25. What is the near power in each eye?
- Prism prescribed as '2 base out' in each eye is used to help with what?
- A patient needs 3 prism diopters base down in the right lens. If the lens is +2.00 D, how much decentration achieves this (Prentice's rule)?
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