Prescription AnalysisCâu 53 / 100
When both eyes require decentration for a smaller PD than the frame, the optical centers are moved which way?
a.Temporally (outward)
b.Vertically only
c.Nasally (inward)
d.Not at all
Giải thích
When the patient's PD is smaller than the frame's distance between lens centers, the optical centers must be decentered inward (nasally) to line up with the pupils and avoid unwanted prism.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- 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)?
- Slab-off prism is used to correct what condition in a multifocal wearer?
- The written Rx 'OU' means what?
- Compensated power calculations are most critical when the fitted vertex distance differs from what?
- A spherical equivalent of the Rx -2.00 -1.00 x 180 is what?
- Reading an Rx that lists 'BO' after a prism value indicates the base is oriented how?
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