spherical lens


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spherical lens

A lens in which all surfaces are spherical.
See also: lens
References in periodicals archive ?
Nearly half (47%) said experience with a spherical lens strongly influenced ('very influential' or 'extremely influential') their recommendation of a toric lens of the same brand.
This resulted from pupillary block by the spherical lens.
In the same way, cylindrical lens, spherical lens, IPD, and visual acuity were detected by the outpatient department of ophthalmology based on automatic optometry method and comprehensive optometry detection.
As it was done in the spherical lens case, an initial estimation of the lens dimensions (LLA and SLA) can be obtained using (13).
A high proportion of eyes (88%) were fitted at the first attempt, and an even higher proportion among existing spherical lens wearers (94%).
20 instant cash back will be given towards the evaluation fees ($59 for spherical lens, $89 for multifocal lens).
Moreover, most of the previous works usually design spherical lens antennas (SLAs) with ideal primary sources models, such as the point source models, incident plane waves [11], end-fire dipoles [14,15], or open-ended waveguide [16], which are inaccurate for the description of practical feed model (PFM).
3mm thin spherical lens, another aspherical lens is designed to be as thin as 0.
A spherical lens -- the kind of glass lens easiest to grind and polish -- has the disadvantage that it doesn't focus light rays to a single point.
Tenders are invited for Univet 619 Over Eye Vision Shield Is Clear In Lens, Blue Frame Approved En 166 Univet Can Be Worn Over Prescription Shield Due To Its Spherical Lens, Version Unvented Or Provided With Indirect Ventilation System.
05mm steeper than the flattest K to minimise flexure and achieve good acuity with a spherical lens --as a guide, fit steeper than flattest K by a third of the difference between the two working K readings.

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