Contact Lenses
The shape and thickness of the lens can be measured as well as the profile of inserts. This gives ultra-precise readings for the form of the front surface, thickness and a detailed view of the optical zone.
Contact Lens Measurement
The images below show a dry contact lens prior to hydration. The data is provided by Polymer Sciences Ltd (http://www.polymer-sciences.com/).
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Figure 1: Form of the front surface, taking the outer section as reference.
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Figure 2: Thickness of the lens.
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Figure 3: Local radius map.
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Figure 4: Detail view of optical zone. The deviation from the best-fit sphere has been magnified to show topography.
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Aspheric Lenses
Aspheric lenses can be measured over the whole optical zone, even including steep sides. As the sensor is kept orthogonal to the surface, there is no loss of accuracy towards the outer regions of the lens. Convex as well as concave lenses can be measured. |
