Studied by 0 people
formula and shit
Base Curve Formula
Residual astigmatism
is defined as the astigmatic refractive error that is present when a contact lens is placed upon the cornea to correct the existing ametropia
Residual astigmatism
Interpret as, 'with spherical contact lens' unless stated otherwise
6 Factors of Physiological Residual Astigmatism
4 Induced Residual Astigmatism
Find the Tear Lens BVP, Ocular astigmatism, and Residual astigmatism
total astigmatism = the cylinder component from rx
corneal astigmatism = keratometer readings
FORMULA
Residual CRA Formula = Total - Corneal
CALCULATED RESIDUAL ASTIGMATISM USING K READINGS
Solve for the Lens Power
Note 
Flashcard (20)