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spherical equivalent |
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equivalent, spherical A spherical power whose focal point coincides with the circle of least confusion of a spherocylindrical lens. Hence, the spherical equivalent of a prescription is equal to the algebraic sum of the value of the sphere and half the cylindrical value, i.e. sphere + cylinder/2. Example: the spherical equivalent of the prescription −3 D sphere −2 D cylinder axis 180ยบ is equal to −4 D. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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