This ensures that the prescription takes into account all focusing requirements, history, feedback from previous glasses, and a thorough understanding of the visual requirements of the wearer. Adam needs to have an extensive and current knowledge of all of the lens types available and we pride ourselves on this.
Optimum lens selection is chosen by discussion during the visual analysis. There are subcategories of progressive lenses: some that range from computer distance to closeup, others specific for driving and the dashboard, perhaps for a music stand at 80cm and to see the conductor as well. Or a good all-rounder. Often a single-focus lens would be recommended.
In recent years there’s been a revolution in progressive lens design – using 3D computer-aided design, advanced lenses are now designed with minimum distortion and have wide zones of clarity to reduce any visual discomfort. In parallel with improved design is improved manufacturing – using nanotechnology, the sophisticated designs can be made with accuracy measured in microns.
We use the most current digital measurement techniques, accurate to 0.25mm, to ensure lens positioning accuracy. We measure reading distance, computer distance and height, dashboard distance, neck angle, all using sophisticated measuring methods. The refraction is measured using the latest Nidek instrumentation and Adam can refract accurately to 0.125 Dioptre.
If the lenses aren’t cut with the same precision as the measurements, errors will creep in. Again, we only use the latest digital methodology to ensure glazing accuracy. We always take into account contrast sensitivity and low illumination variation, such as during night driving.