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Lens Geometry
Geometry describes how the surfaces of a lens are designed and how the optical power is distributed across the different zones. It is one of the reasons why two lenses made to the same prescription can offer different visual experiences.
It’s not just the alcohol content that matters
The sphere, cylinder, axis and addition determine the prescribed correction; the geometry dictates how that correction is distributed across the lens. This affects the size of the effective zones, lateral behaviour, thickness, curvature and customisation options.
Spherical, aspheric and free-form
A lens aspherical It uses surfaces with variable curvature to achieve a flatter profile and to better control certain optical trade-offs compared with a conventional spherical geometry. In the free-form lenses The surface area can be calculated and processed point by point, taking into account the specifications and, where specified in the design, individual parameters and the intended location of use.
Progressive, office and single-vision lenses
In the progressive lenses e office, the layout organises areas according to different distances and the transitions between them. Even a single-focus However, it may have a more or less advanced design. For this reason, the specification alone does not identify the same product.
The Isolani technical project
The chosen geometry must be consistent with the frame, dimensions, angles and the way the spectacles are actually worn. The Behavioural Centring collects these parameters; the Isolani Laboratory Complete assembly and final inspection. The page on eyeglass lenses explores how we combine international technology with local expertise.
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The information on this page is provided for information purposes only and relates to the optical and commercial sectors. It does not contain any medical, clinical or diagnostic content.