i am an optometrist and i need to any link that talks about Aspheric lens
thanks
i am an optometrist and i need to any link that talks about Aspheric lens
thanks
Perhaps it was Harry who posted this:
What is an Aspheric in simple terms ?
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Curved surfaces follow the geometric formula for conic sections:
Y(squared) = 2(R)(X) + (P)X(squared)
The shape of the conic section depends on the value of P, where R is the radius of curvature of the surface at the vertex.
Values of P
a) P > 1 you obtain an oblate ellipse
b) P = 1 you obtain a circle
c) 0<P<1 you obtain an prolate ellispe
d) P = 0 you obtain a parabola
e) P < 0 you obtain a hyperbola
If you take this formula and rotate through the Z axis you will obtain a surface that falls away from the apex at a constant rate. The easiest
surface to generate was P = 1 a circle, which when rotated through
Z gives a simple spherical surface the simplest to manufacture. No
all aspheric surfaces are not the same - It depends on what value of P
each manufacturer picks.
Sounds like it might have been me, here is a link for a more patient oriented explanation.
http://www.eyetopics.com/articles/15...-Aspheric.html
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*Dave at OptiVision has a web based tracer integration package that's awesome.
thanks you
but i want another links if any body can help me
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