Prescription AnalysisCâu 51 / 100
Compensated power calculations are most critical when the fitted vertex distance differs from what?
a.The frame PD
b.The refracted vertex distance
c.The seg height
d.The base curve
Giải thích
The refraction is done at a specific vertex distance; when the dispensed frame sits at a different vertex distance, the effective power shifts, so compensation restores the intended power at the eye.
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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?
- A spherical equivalent of the Rx -2.00 -1.00 x 180 is what?
- When both eyes require decentration for a smaller PD than the frame, the optical centers are moved which way?
- Reading an Rx that lists 'BO' after a prism value indicates the base is oriented how?
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Đội Ngũ Biên Tập PrepPass · Đối chiếu với ABO (American Board of Opticianry) Certified Optician Exam · Quy trình kiểm tra