From their beginning as post-cataract lenses, aspheric lens designs have improved overall lens performance and comfort, and given ECPs premium plus, minus, or PAL lens designs. While aspheric and atoric designs can be created in any lens material, manufacturers tend to produce their new releases in these forms. They are a large part of premium lens lines in mid-index, high-index, polycarbonate, and Trivex materials. Aspheric and atoric lenses are also the basis of many single-vision and progressive addition lenses.

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Remember Me? What's New? Results 1 to 18 of Thread: Atoric. Thread Tools Show Printable Version. Atoric What does an atoric lens mean? Originally Posted by shanbaum. It's a lens which affords two major power meridia, oriented at ninety degrees to one another, each of which is an asphere. So is it similar to aspheric? Is it a design that you order to a lens material like you would order aspheric to a high plus to make it flatter on the front? So who would you recommend an atoric design to?

Shanbaum, see if I'm amplifying your answer correctly: When an optician wants to recommend a thinner, flatter, lighter lens for a spherical plus Rx or a somewhat thinner, lighter lens for a spherical minus Rx, the base curve is substantially flattened from the normal corrected curve and then the lens flattens further towards the periphery, in order to compensate for the abberation induced by using a flatter base curve than the corrected curve.

In a spherocylinder Rx, the flattening towards the periphery of the lens in an atoric lens is different for both principal meridia, compensating for abberration better than if just a asphere was used for a spherocylinder. Bottom line: when making a thinner, flatter lens, aspheric compensation is needed for a sphere and atoric compensation is needed for a spherocylinder, if you want to do it right.

The catch: atoric lenses are rare. Your choices are Sola's Vizio 1. Originally Posted by drk. I knew that. I was given the visual picture that the aspheric minus front surface is like a "Frisbee", I just forgot. Aspheric: Not a sphere Atoric: Not a toric torus Technically a lens in which one curve becomes longer or shorter in radius in the case of aspheres, Two or more curves become longer or shorter in radius in atorics. Chip Sola has an hour or two you can get credit for listening to on the subject of atorics.

Hello, how can i get this artical Am I wrong in my assuptions and what differences are there between the two? Originally Posted by F. Originally Posted by eromitlab. Replies: 2 Last Post: , AM. Replies: 5 Last Post: , PM. Atoric Lenses By eyesguy in forum Ophthalmic Optics. Replies: 3 Last Post: , PM. By pschlottman in forum Ophthalmic Optics. Replies: 0 Last Post: , AM. Bookmarks Bookmarks Digg del.

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Toric lens

This course will present the fundamental principles of ophthalmic lens design, including a review of lens aberrations, corrected curve theory, and asphericity. This is a technical, intermediate level course intended for dispensing opticians, laboratory technicians, and paraoptometric personnel. An understanding of both basic mathematics and basic optics is required. The focal power of a lens is simply equal to the net effect of its front and back surfaces. Where P is focal power in diopters, F is the front surface power in diopters, and B is the back surface power in diopters.


Getting the Angle on Aspheric and Atoric Lenses

A toric lens is a lens with different optical power and focal length in two orientations perpendicular to each other. One of the lens surfaces is shaped like a "cap" from a torus see figure at right , and the other one is usually spherical. Such a lens behaves like a combination of a spherical lens and a cylindrical lens. Toric lenses are used primarily in eyeglasses , contact lenses and intraocular lenses to correct astigmatism. A torus is the spatial body resulting when a circle with radius r rotates around an axis lying within the same plane as the circle, at a distance R from the circle's centre see figure at right.

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