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pro vyhledávání: '"William F. Harris"'
Autor:
Tanya Evans, William F. Harris
Publikováno v:
African Vision and Eye Health, Vol 78, Iss 1 (2019)
No abstract available.
Externí odkaz:
https://doaj.org/article/58109707029d42798724b5d2ed87fae7
Autor:
Tanya Evans, William F. Harris
Publikováno v:
African Vision and Eye Health, Vol 77, Iss 1, Pp e1-e8 (2018)
Background: Chromatic differences in power, refractive compensation, position and magnification have been described in the literature for Gaussian eyes. Aim: This article explores these definitions and defines chromatic properties for eyes that have
Externí odkaz:
https://doaj.org/article/af02f34706144d2eaffd06ae91caeec3
Publikováno v:
African Vision and Eye Health, Vol 75, Iss 1, Pp e1-e3 (2016)
Because dioptric power matrices of thin systems constitute a (three-dimensional) inner-product space, it is possible to define distances and angles in the space and so do quantitative analyses on dioptric power for thin systems. That includes astigma
Externí odkaz:
https://doaj.org/article/8183d434efdc40f5b559fd11cb3153c3
Publikováno v:
African Vision and Eye Health, Vol 75, Iss 1, Pp e1-e7 (2016)
Purpose: Providing vision correction in communities where healthcare facilities are unavailable is problematic. Here, we explore the possibility of using pinholes as near visual aids in the developing world. Method: Uncompensated (without the pinhol
Externí odkaz:
https://doaj.org/article/63ce75aa6f5f45ddb8fcc7d0c02eed1b
Autor:
Tanya Evans, William F. Harris
Publikováno v:
African Vision and Eye Health, Vol 75, Iss 1, Pp e1-e3 (2016)
The transference defines the first-order character of an optical system; almost all the system’s optical properties can be calculated from it. It is useful, therefore, to have some idea of how it depends on the frequency of light. We examine the de
Externí odkaz:
https://doaj.org/article/0a8c3cac3d7f41329a0725823e6aea10
Autor:
William F. Harris
Publikováno v:
African Vision and Eye Health, Vol 74, Iss 1, Pp e1-e2 (2015)
In a previously published paper, the present author asserted that Yves Le Grand came veryclose to describing the dioptric power matrix in 1945 and that, in particular, he presentedexpressions for the entries of the matrix. The purpose of this note is
Externí odkaz:
https://doaj.org/article/96f9a6d4db774130a7bfa6b9bace2e91
Autor:
William F. Harris, Tanya Evans
Publikováno v:
Journal of Modern Optics. 65:879-887
In Gaussian optics all observers experience the same magnification, the instrument’s angular magnification, when viewing distant objects though a telescope or other afocal instruments. However, ana...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::99f519324edfd46c395aa00c29b79d43
https://doi.org/10.1080/09500340.2017.1414891
https://doi.org/10.1080/09500340.2017.1414891
Autor:
Tanya Evans, William F. Harris
Publikováno v:
Ophthalmic and Physiological Optics. 37:353-357
PURPOSE Cardinal points are used for ray tracing through Gaussian systems. Anti-principal and anti-nodal points (which we shall refer to as the anti-cardinal points), along with the six familiar cardinal points, belong to a much larger set of special
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cd810d01cce387ab909353cd1aa73d9a
https://doi.org/10.1111/opo.12373
https://doi.org/10.1111/opo.12373
Publikováno v:
Ophthalmic and Physiological Optics. 37:347-352
PURPOSE To show that 14-dimensional spaces of augmented point P and angle Q characteristics, matrices obtained from the ray transference, are suitable for quantitative analysis although only the latter define an inner-product space and only on it can
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8fe45a0b269926c9b5dee42aa1feea8d
https://doi.org/10.1111/opo.12370
https://doi.org/10.1111/opo.12370
Autor:
William F. Harris, Tanya Evans
Publikováno v:
African Vision and Eye Health, Vol 78, Iss 1 (2019)
No abstract available.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::35d45f64f33fc1b06d9ae27b072a658d
https://doi.org/10.4102/aveh.v78i1.540
https://doi.org/10.4102/aveh.v78i1.540