Hello there i am having problems solving an Abo review question
I tried using the sagFormula and thick lens formula but still cant get the answer
What power lens is obtained if the
front surface power - +16.00
back suface power - -1.75
Center thickness - 8.0 mm
Diameter - 54 mm
Lens - CR-39 (n=1.50)
Answer is +15.62
Can't get the answer, please reply back
Also when doing Slab OFf/vertical imbalace problems, does lens style, Add power, and vertex has any importance ? for example: patient is looking 5mm below, and problem shows vertex: 12 mm and FT25 lens style addpower +2.00.
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