Prescription AnalysisCâu 49 / 100
Slab-off prism is used to correct what condition in a multifocal wearer?
a.Vertical imbalance at near between the two eyes
b.Horizontal PD error
c.Excess add power
d.A scratched segment
Giải thích
Slab-off grinds prism into one lens to compensate for the vertical prism imbalance created at the reading level when the two eyes have unequal Rx (anisometropia), restoring comfortable near fusion.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- 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)?
- 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?
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