Document Detail


Interconverting the matrix and principal meridional representations of dioptric power in general including powers with nonorthogonal and complex principal meridians.
MedLine Citation:
PMID:  11396399     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The principal meridians of the powers of thick astigmatic systems, like the eye, are not necessarily at right angles. The consequence is a class of phenomena included in the category commonly described as irregular astigmatism. The conventional principal meridional representation of power, however, is unsuited to quantitative analysis. This paper presents equations for converting from the principal meridional form of power to a representation, the dioptric power matrix, which is amenable to quantitative analysis. It generalizes an earlier paper which treated only powers of a conventional form in which the principal meridians are always at right angles. It copes in particular with what are known as asymmetric powers. A routine is also presented for converting in the reverse direction, from the power matrix to the principal meridional form of power. The principal meridional form of power turns out not always to be unique, there being distinct powers (they are asymmetric) with the same principal powers and meridians. Thus, in general, the dioptric power matrix is a satisfactory representation of power while the principal meridional representation is not.
Authors:
W F Harris
Related Documents :
2632589 - Arsonists and sexual arousal to fire setting: correlation unsupported.
24104109 - Near-field thermal radiation between graphene-covered doped silicon plates.
16523769 - Nonlinearity of high-power optical fiber power meters at 1480 nm.
23023129 - En échelon and orthogonal fault ruptures of the 11 april 2012 great intraplate earthqua...
10879459 - Peak power assessment in isokinetic dynamometry.
23927109 - High frequency acoustic transmission loss of perforated plates at normal incidence.
22772199 - Polarization behavior of femtosecond laser written optical waveguides in ti:sapphire.
23004849 - Quasiattractors in coupled maps and coupled dielectric cavities.
20577339 - Ray tracing through gradient-index media: recent improvements.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)     Volume:  21     ISSN:  0275-5408     ISO Abbreviation:  Ophthalmic Physiol Opt     Publication Date:  2001 May 
Date Detail:
Created Date:  2001-06-08     Completed Date:  2001-06-21     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8208839     Medline TA:  Ophthalmic Physiol Opt     Country:  England    
Other Details:
Languages:  eng     Pagination:  247-52     Citation Subset:  IM    
Affiliation:
Optometric Science Research Group, Department of Optometry, Rand Afrikaans University, P.O. Box 524, Auckland Park 2006, South Africa. wfh@na.rau.ac.za
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Data Interpretation, Statistical
Humans
Linear Models
Mathematics*
Optics and Photonics*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  The pattern electroretinogram (PERG) with contralateral corneal reference.
Next Document:  [Clinical study of zirconium oxide bridges in the posterior segments fabricated with the DCM system]...