Topic
Spherometer
About: Spherometer is a research topic. Over the lifetime, 100 publications have been published within this topic receiving 519 citations.
Papers published on a yearly basis
Papers
Patent•
17 Apr 1998
TL;DR: In this article, an optical lens element including a front and back surface, at least one surface being continuous, and forming a prescription (Rx) zone and optionally a non-prescription peripheral temporal zone, exhibiting a change of base curve across the field of vision of the wearer, bearing a surface correction to at least partially adjust for optical errors.
Abstract: An ophthalmic article inlcuding a first lens element having a front and rear surface; and a complementary lens element capable of bearing a prescription (Rx) surface having a front surface so shaped to closely approach at least a portion of the rear surface of the first lens element; the complementary lens element providing at least a portion of the refractive power required by the wearer; the ophthalmic article remaining substantially free of optical distortion. Also, the application discloses an optical lens element including a front and back surface, at least one surface being continuous, and forming a prescription (Rx) zone and optionally a non-prescription peripheral temporal zone, at least one surface exhibiting a change of base curve across the field of vision of the wearer; the front and/or back surface bearing a surface correction to at least partially adjust for optical errors. A method of designing the lens element is also disclosed.
86 citations
TL;DR: In this paper, four sheet metals, having quite different combinations of R-values and strain-hardening behavior were tested in uniaxial tension, through-thickness compression and bulge tests.
63 citations
Patent•
10 Feb 2004
TL;DR: In this article, a mirror assembly is provided having a base member and a dome lens member, each of which has a varying radius of curvature with a center surface portion having a center-surface radius greater than the radius of a peripheral surface.
Abstract: A mirror assembly is provided having a base member and a dome lens member. The dome lens member has a varying dome lens radius of curvature with a center surface portion having a center surface radius of curvature and a peripheral surface portion having a peripheral surface radius of curvature greater than the center surface radius of curvature.
46 citations
TL;DR: The use of digital holographic intrerferometry in the testing of simple thin lenses is explored and the method can be utilized to measure the parameters of plano-convex and concave lenses also.
Abstract: The use of digital holographic intrerferometry in the testing of simple thin lenses is explored. Focal length, radius of curvature, and refractive index are the lens parameters that can be determined using this method. The digital holograms using the lens under test are recorded at various positions of the test lens using off-axis geometry. This is combined with a digitally computed plane wavefront to determine the curvature of the light beam emerging from the test lens. Focal length is the position of the test lens where a single fringe results. The radius of curvature of the test lens is also determined similarly using a long focal length lens to concentrate a collimated beam onto the test lens. The nonuniformities on the lens surface could also be found by using this method. The implementation of the method is shown by using computer simulations in the case of biconvex lenses. The method can be utilized to measure the parameters of plano-convex and concave lenses also.
28 citations
Patent•
28 Sep 1982TL;DR: An aspherical lens for an indirect ophthalmoscope, comprising a single biconvex lens having a first surface with a radius of curvature r 1, and a second surface facing the examiner and having a paraxial radius r 2, was constructed in this paper.
Abstract: An aspherical lens for an indirect ophthalmoscope, comprising a single biconvex lens having a first surface with a radius of curvature r 1 , and a second aspherical surface facing the examiner and having a paraxial radius of curvature r 2 . The lens being constructed to meet the following requirements: ##EQU1## where D is the effective diameter of the lens, y is the displacement in the direction of an optical axis of an aspherical shape as expressed by a rectangular coordinate system having the origin at the vertex of the second surface and normalized by r 2 , and x is the displacement in a direction normal to the optical axis and also normalized by r 2 .
26 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2019 | 3 |
| 2017 | 3 |
| 2016 | 3 |
| 2015 | 5 |
| 2014 | 2 |
| 2013 | 3 |