Cantor + Missel invests in contact lens development

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David Cantor formed the original
company in 1964 in London and
it relocated to Brackley in
Northamptonshire in the 1970s.

David Cantor, managing director of Cantor + Nissel Limited, the leading
UK manufacturer of specialist contact lenses, is convinced that in order to continue as a leading supplier of specialist soft lenses the company must continue to invest in the best available technology and use this significant investment to deliver added value products to the company’s client practitioners.
In the past year, Cantor + Nissel has invested substantially in new automated manufacturing technology with the
purchase of several Optoform 40 lathes from Sterling Ultraprecision Inc. The Optoform 4Q, complete with its ground-breaking fast tool servo, is widely regarded as the most sophisticated contact lens manufacturing platform, now available. Cantor + Nissel use this combination to deliver high accuracy toric lenses to its worldwide client base.
Wavefront technology now available in any Cantor + Nissel soft lens
An immediate benefit to practitioners is that the new technology has enabled Cantor + Nissel to include high accuracy aspheric wavefront optics as an option across the company’s complete range of soft lenses, including toric soft lenses. When applied to soft contact lenses, the terms aspheric optics and wavefront technology mean that the power profile of the lens has been modified to reduce the spherical aberration when the lens is worn; usually this feature is only noticeable in cases when the wearer’s pupil diameter is relatively large. David Cantor believes that by providing practitioners with the choice of having any Cantor + Nissel soft lens delivered with wavefront technology optics, he is providing added value which will benefit many wearers.

While acknowledging that, although there has been some discussion as to the clinical benefits such lenses may offer’2, it is also clear the lens design is a factor in the clinical outcome3. As a significant proportion of the soft lenses supplied by Cantor + Nissel have higher powers, the benefits of controlling spherical aberration will be noticed by manv wearers. While many wavefront technology products do not specify clearly what it is that the lens is designed to correct, the Cantor + Nissel lens is well defined and has been measured to be exactly as it says on the label.
The optics of the new lenses are based on a development of the company’s EV product range. The new design has developed the EV concept further, based on recent work in the analysis of wavefront controlled aspheric soft lenses.
The standard Cantor + Nissel aspheric optics lens is calculated to have negative spherical aberration of 0.12 dioptres at an optic zone diameter of 6.00mm; this is intended to neutralise the average spherical aberration of the human eye
which is about +0.12 dioptres at a similar zone diameter4-5. This power management is achieved by using an aspheric front surface which controls the power profile across the optic zone. Cantor + Nissel has used power mapping
instruments to measure a very large range of lens powers to confirm that the power profiles are as intended. The quality control system at Cantor + Nissel will guarantee that every wavefront technology lens will be measured using
a power mapping instrument to confirm that its power profile matches the specification.


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