Ophthalmic OpticsQuestion 9 of 100
The base curve of a lens refers to which surface?
a.The bevel edge
b.The reference curve from which the lens is made, usually the front
c.The segment line
d.The temple curve
Explanation
Base curve is the fixed reference curve used as the starting point for making a lens, conventionally the front surface. The back surface is then ground to achieve the required prescription power.
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- The power of a lens surface increases as its radius of curvature does what?
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- Add power on a multifocal lens represents what?
- If the distance Rx is -3.00 D and the add is +2.00 D, what is the total power in the reading portion?
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