Ophthalmic OpticsQuestion 10 of 100
Add power on a multifocal lens represents what?
a.The distance sphere power
b.The prism amount
c.The additional plus power for near vision
d.The cylinder axis
Explanation
The add is the extra plus power in the reading segment that supplements the distance prescription to help a presbyopic patient see clearly at near. It is always a plus value.
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Related questions on this topic
- What is the total power of a lens with a front surface of +6.00 D and a back surface of -2.00 D (thin lens approximation)?
- Vergence describes what property of light?
- The base curve of a lens refers to which surface?
- If the distance Rx is -3.00 D and the add is +2.00 D, what is the total power in the reading portion?
- Vertex distance is the measured space between what two points?
- Chromatic aberration is caused by what?
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