Ophthalmic Optics第 14 / 100 题
Which of the following describes a plano lens?
a.+2.00 D of plus power
b.A high minus lens
c.A lens with cylinder only
d.A lens with no refractive power
解析
Plano means flat or zero power. A plano lens has no sphere or cylinder power and does not change vergence, though it may still carry a tint or coating.
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