FORMULAS Flashcards by Megan Blomer

Q

Lens effectivity

A

Fnew = Fcurrent / (1-d Fcurrent)

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Q

Residual astigmatism

A

RA= spec cyl - corneal cyl

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Q

Over refraction

A

OR= sphere power - diagnostic power

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Q

Conversion formula (KS)

A

P= (n-1) / r OR. 337.5 / radius of curvature

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Q

SAM / FAP

A

Steeper add minus
Flatter add plus

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