Prescription AnalysisCâu 42 / 100
A -8.00 D lens is moved closer to the eye. Its effective minus power does what?
a.Decreases (less minus effect)
b.Increases (more minus effect)
c.Stays exactly the same
d.Becomes plus power
Giải thích
For a minus lens moved closer to the eye, the effective power decreases; moved farther away, the effective minus power increases. Vertex compensation adjusts for this in high prescriptions.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Monocular PD is measured from what to what?
- A binocular distance PD of 64 mm typically corresponds to what near PD range?
- Compensated (effective) power differs from the prescribed power mainly due to what?
- Neutralizing a lens with a lensmeter finds what point?
- Hand neutralization of an unknown lens uses what technique?
- With-the-rule astigmatism typically has the cylinder axis oriented near what?
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