What is aspheric optics contact lens?
What is aspheric optics contact lens?
An aspheric lens has varying curvature across the surface of the lens rather than a uniformly spherical shape. Aspheric contacts can correct spherical aberration and reduce the blurring of vision. They can provide sharper, clearer, and brighter vision in some people.
What is an aspheric contact lens?
Are trivex lenses aspheric?
Polycarbonate, high index and Trivex are wonderful materials for ophthalmic lenses. The confusing part is that they are lens materials whereas aspheric describes a lens design. So, polycarbonate, high index and Trivex are all available in spherical and aspheric designs.
Why ededmund optics ®?
Edmund Optics ® manufacturers millions of optics every year throughout our four global facilities. Join us as we take you through the creation of an aspheric lens, from molding to grinding to polishing, centering, and metrology. If playback doesn’t begin shortly, try restarting your device.
What are aspheric lenses?
Aspheric lenses utilize a single element design which helps minimize the number of lenses found in multi-lens optical assemblies. Said another way, unlike conventional lenses with a spherical front surface, aspheric lenses have a more complex front surface that gradually changes in curvature from the center of the lens out of the edge of the lens.
How do you calculate the surface profile of an aspheric lens?
Aspheric lenses have been traditionally defined with the surface profile (sag) given by Equation 1: (1)Z(s) = Cs2 1+√1−(1+k)C2s2 +A4s4 +A6s6 +A8s8+… Z (s) = C s 2 1 + 1 − (1 + k) C 2 s 2 + A 4 s 4 + A 6 s 6 + A 8 s 8 +…
Why don’t imaging lenses use spot sizes from the asphere?
The spot sizes from the asphere are several orders of magnitude less than those of a spherical lens. To achieve the required performance of an imaging lens, optical designers often have to stop down, or increase, the f/# of their design. While this may achieve the desired resolution goal, this technique results in a loss of light throughput.
