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%
% Partial and in progress implementation of Ansi Z136.1-2007 standard for computing
% maximum permissable exposure.
%
% *****************************************************************
% IMPORTANT:
% a) Individuals using these routines must accept full responsibility
% for light exposures they implement. We recommend that values computed
% with these routines be carefully checked against independent calculations.
% We have done our best to follow the standard, but it is very complex and
% there may be errors.
%
% b) As of March, 2013, these routines are still very much a work
% in progress and should thus be treated with special caution. See
% AnsiZ136MPEBasicTest and AnsiZ136MPEDeloriTest, both for test
% code, and for comments about points of uncertainty.
%
% c) Particularly obscure to me at present is the limiting cone aperture
% section described with an asterisk in Table 2 of the 2007 standard
% document.
%
% d) The field's knowledge of safe light levels is evolving, and it is important
% to keep abreast of current research and not to rely soley on the
% Ansi standard. In particular, note that there
% are reports of disrubption at light levels below the limits specified
% in the Ansi 2007 stanard. See for example:
% Morgan et al., (2008), IOVS, 49, 3715-3729.
% Morgan et al., (2009), IOVS, 50, 6015-6022.
% Hunter et al., (2012), Prog. Ret. Eye. Res., 31, 28-42.
%
% e) Apparently a new version of the Ansi Z136 standard is forthcoming,
% but I do not have information as to what changed.
%
% f) The Z136 standard is for laser light, which is coherent and monochromatic.
% Different standards apply for broadband lights. Two relevant references are:
% ISO 15004-2:2007, Ophthalmic instruments -- Fundamental requirements and
% test methods -- Part 2: Light hazard protection.
%
% ICNIRP (International Commission on Non-Ionizing Radiation Protection) Guidelines,
% (1997), Guidelines on exposure to broad-band inchoherent optical radiation (0.38 to 3 uM),
% Health Physics, 73, 539-554.
% The second seems a little old, but is the most recent ICNIRP guideline for broadband
% that I could easily locate.
%
% - David Brainard, March 6, 2013.
% *****************************************************************
%
% REFERENCES.
% Ansi Z136.1-2007. The standard document. The more recent Ansi Z136.8-2012
% refers back to the 2007 document for the MPE calculations. But see
% point d) in the notes above.
%
% Delori et al., 2007, JOSA A, 24, 1250-1265. Provides explanation
% about many of the calculations in the 2000 version of the standard.
%
% AnsiZ136MPEBasicTest - Test the suite of routines. Generates many figures that should match those in the standard.
% AnsiZ136MPEComputeCa - Compute constant Ca, Table 6
% AnsiZ136MPEComputeCb - Compute constant Cb, Table 6
% AnsiZ136MPEComputeCc - Compute constant Cc, Table 6
% AnsiZ136MPEComputeCe - Compute constant Ce, Table 6
% AnsiZ136MPEComputeExtendedSourceLimit - Compute overall MPE limit for extended sources, Table 5b
% AnsiZ136MPEComputeExtendedSourcePhotochemicalLimit - Compute photochemical MPE for extended sources, Table 5b
% AnsiZ136MPEComputeLimitingConeAngle - Compute limiting cone angle, Table 6
% AnsiZ136MPEComputeT2 - Compute constant T2, Table 6
% AnsiZ136MPEDeloriTest - Tests our computations against those from Delori's spreadsheet.
% Copyright (c) 2013 by David Brainard
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