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Thread: Base Curve selection -Vogel ???

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    OptiBoard Professional skirk1975's Avatar
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    Smilie Base Curve selection -Vogel ???

    What is the formula for bast curve selection?

    Is Vogel's Law the most used or only one? What is it again?

    Also , give me a brief refresher on why there is an optimum base curve.

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    Rising Star lensgrinder's Avatar
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    Quote Originally Posted by skirk1975 View Post
    What is the formula for bast curve selection?
    Plus Lens: fbc = (spherical eq.) + 6.00
    Minus Lens: fbc = (spherical eq./2) + 6.00

    How ever I do recommend using the manufactures base curve chart, but in the absence of a chart use the formula. If you are using an aspheric design do not use Vogel's Rule, use the manufactures recommendation.

    Quote Originally Posted by [/SIZE
    skirk1975;167410]Also , give me a brief refresher on why there is an optimum base curve.
    Using "best form" lenses helps reduce oblique astigamatism and curvature of field. When you look away from the lens center you will experience a change in the power of the lens causing the abberations listed above. Manufacturers place certain Rx's on a base curve the will help reduce these abberations.

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    Carl Zeiss Vision OptiBoard Gold Supporter Darryl Meister's Avatar
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    If you have some spare time on your hands, you can also read a course on single vision lens design.
    Darryl J. Meister, ABOM

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