Prescription Analysis第 53 / 100 题
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
解析
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.
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