A Whitwell 1930 Trans. Opt. Soc. 32 101 doi:10.1088/1475-4878/32/3/302
Fused bifocal spectacle lenses
A Whitwell
In designing a fused bifocal spectacle lens we have at our disposal three radii which can be varied to satisfy the two conditions, that the distance power and the reading addition have given values, so leaving one degree of freedom.
An expression is found for the convergence of the circles of least confusion of oblique pencils of small aperture; from this, by equating the aberration term to zero, we obtain a quadratic equation the roots of which fix the radius of one surface of the lens subject to the third condition that the circles of least confusion lie on a sphere and so focus on the macula of the eye.
- PACS
-
42.66.Ct Anatomy and optics of eye
- Subjects
- Dates
-
Issue 3 ( 1 January 1930)
Received 20 February 1931
-
Fused bifocal spectacle lenses
A Whitwell 1930 Trans. Opt. Soc. 32 101
-
High-resolution PET detector design: modelling components of intrinsic spatial resolution
Jennifer R Stickel and Simon R Cherry 2005 Phys. Med. Biol. 50 179
-
Coherent control of autoionization in optically dense media
David Petrosyan and P Lambropoulos 2001 J. Phys. B: At. Mol. Opt. Phys. 34 1711
-
A distortion of pseudotetramers coupled with the Jahn–Teller effect in the geometrically frustrated spinel system CdV2O4
Masashige Onoda and Junichi Hasegawa 2003 J. Phys.: Condens. Matter 15 L95
-
Charge transfer in H+-Na0 collisions: atomic orbital calculations
R Shingal et al 1986 J. Phys. B: At. Mol. Phys. 19 309
-
Optimization of calcination conditions on the Bi-2223 kinetic formation and grain size
V Garnier et al 2000 Supercond. Sci. Technol. 13 602
-
Dynamics of vortices in quasi-two-dimensional classical Heisenberg magnets with weak easy-plane anisotropy
A R Volkel et al 1992 J. Phys.: Condens. Matter 4 9411
-
Reversors and symmetries for polynomial automorphisms of the complex plane
A Gómez and J D Meiss 2004 Nonlinearity 17 975
-
Depth of interaction resolution measurements for a high resolution PET detector using position sensitive avalanche photodiodes
Yongfeng Yang et al 2006 Phys. Med. Biol. 51 2131
-
On the scattering method for the
-equation and reconstruction of convection coefficients
Alexandru Tamasan 2004 Inverse Problems 20 1807
Related review articles
What's this?- Targeted proteins for diabetes drug design
- The condensed chromatin fiber: an allosteric chemo-mechanical machine for signal transduction and genome processing
- Nanoparticles for neuroimaging