Residual Astigmatism

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8 Terms

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Base Curve Formula

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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

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Residual astigmatism

Interpret as, 'with spherical contact lens' unless stated otherwise

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6 Factors of Physiological Residual Astigmatism

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4 Induced Residual Astigmatism

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Find the Tear Lens BVP, Ocular astigmatism, and Residual astigmatism

<p>Find the Tear Lens BVP, Ocular astigmatism, and Residual astigmatism</p><p></p>
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<p>total astigmatism = the cylinder component from rx</p><p>corneal astigmatism = keratometer readings</p><p><strong>FORMULA</strong></p><p>Residual CRA Formula = Total - Corneal</p>

total astigmatism = the cylinder component from rx

corneal astigmatism = keratometer readings

FORMULA

Residual CRA Formula = Total - Corneal

CALCULATED RESIDUAL ASTIGMATISM USING K READINGS

<p><strong>CALCULATED RESIDUAL ASTIGMATISM USING K READINGS</strong></p><p></p>
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Solve for the Lens Power

<p><strong>Solve for the Lens Power</strong></p><p></p>