This customized vision correction solves unique vision problems and provides wearers with superior clarity, and sharper, brighter eyesight, whether they are nearsighted, farsighted, or have a mild astigmatism.  High definition lenses also enable patients to enjoy up to 20 percent wider vision channel for both intermediate and near distances, this makes computer use and reading more comfortable and enjoyable.

Airy diskand resolution

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High definition lenses, also known as digital lenses, are now available. These advanced technology lenses offer a number of benefits over conventionally surfaced lenses.   Unlike conventional lenses, HD lenses are manufactured using digital computer technology and diamond-cutting tools that allow the lenses’ surface to be customized to an individual’s eyes.

Airy diskformula

[1] Methods in Cell Biology, Vol. 81, DOI: 10.1016/S0091-679X(06)81002-2, David E. Wolf, The Optics of Microscope Image Formation, (2007).

Radius ofAiry diskformula

where,           Î± -- The convergence semi-angle (also called maximum diffraction angle);           Î» -- The wavelength of the incident electron beam.

High definition lenses are ideal for all patients who want to experience the latest in lens technology, while those with high prescriptions and large amounts of astigmatism will experience the greatest wow factor.

Airy Disktelescope

The diffraction effect of the objective aperture is important for HRTEM imaging. The radius of the Airy disk produced by the objective aperture is given by,          rAiry ~ 1.2λf/D ---------------- [3743b] where,          f -- The focal length of the lens;          D -- The aperture diameter.

Airy diskcalculator

The quality of a high definition lens is similar to the quality of a digital camera. The higher the pixel count, the higher the degree of resolution, resulting in crisp vision with unmatched depth and clarity.

Based on the Rayleigh criteria, the ability (spatial resolution) of the microscope to resolve two spots as two essentially relates to how sharply the Airy disks are defined. As the disks get closer, the intensity dip between the two spots becomes smaller. For instance, the two spots can be resolved in Figure 3743 (a) and (b), while they cannot be resolved in Figure 3743 (c).

This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.

For an ideal objective lens, the incident electron probe simply forms an Airy disk in the back focal plane of the lens. This disk is the Fourier transform of the uniformly illuminated condenser aperture.

In conventional TEM system, the existence of spherical aberration requires the utility of very small apertures to maximize the spatial resolution, while the resolution will also be limited by diffraction if the apertures are too small.