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ABO NOCE Basic Opticianry

Category - Ophthalmic Optics

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In this trifocal prescription, what is the mid-range add power?

Prescription: OD -.25 -2.50 X 87 OS -.75 -2.25 X 42 +3.00 Add

+1.00
+1.50
+2.00
None of the above

Explanation

Answer: B - The mid-range add power of any trifocal prescription is always half of the full power of the bifocal.

Therefore half of the +3.00 add is +1.50.

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