Orbit 1.8Other Products |
Run Orbit 1.8 under Leopard on your Intel Mac!
The Orbit 1.8 Gaze Mechanics Simulation remains* the most powerful, reliable, and informative simulation of ocular static mechanics and strabismus despite it's limitations, principally that it does not implement "coordinated EOM pulleys", but only "passive EOM pulleys", which do not behave correctly in tertiary gaze; see Miller (2007).
When OSX was introduced in 2001, Orbit 1.8, being a MacOS 68K application, ran only in "Classic" emulation mode. Unfortunately, with OSX 10.5 (Leopard®), and related to Apple's adoption of Intel processors, Classic disappeared.
"Orbit 1.8 on Intel" (OOI) is a good solution to this problem**:
Note that OOI will not work on some Mac configurations ("ERROR: Cannot map RAM: Cannot allocate memory") due to a known bug in the underlying emulation software (see: http://www.emaculation.com/forum/viewtopic.php?t=5722). We will update OOI if a fix becomes available, but until then: if it works for you, enjoy; if not, sorry.
If you study eye movement control or treat strabismus, you will find these materials uniquely interesting.
Orbit™ is a software tool that provides easy access to a sophisticated biomechanical model, able to simulate classical strabismus syndromes and data from individual cases, clarifying diagnostic and treatment possibilities in well-defined physiologic terms.
2.0 MB
Orbit will initially function in "demonstration mode", operating normally, except that output functions (saving, exporting and printing) will be disabled. You may find this sufficient for your purposes. If you previously purchased an Orbit 1.8 license, gain full functionality by entering your license information, as before. If you have lost your registration information, I can provide it.
Three kinds of online help are available within Orbit. Launch Orbit and read the explanatory documents in the Guide Menu 
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for help with Orbit windows. Use (extensive!) Balloon Help (under the Help item on the menu bar) to explain labels, fields and other objects. The Orbit User's Manual and Release Notes are available for download below.
5.2MB
Click the User Manual Icon or text link to download Edition 1.0 (Sept 1999) of the Orbit™ 1.8 User Manual as a PDF (Portable Document Format) file.
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Projects & Publications Get journal articles that describe the mathematical analyses implemented by Orbit, the several lines of physiologic research related to it, and its application to problems of oculomotility and strabismus. |
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Movies Click for a list of downloadable Orbit Quicktime™ movies, which demonstrate normal and strabismic binocular alignment. These movies were created with the Orbit Gaze Mechanics Simulation, but do not require it for viewing: they play on any platform that supports Quicktime multimedia. |
* We worked with UAR, providing them with our source code, so their SEE++ might replace Orbit 1.8. However, despite it's modern program structure and fine graphics, when we last examined SEE++ (2005) we found many problems, including that it did not contain a correctly implemented biomechanical model.
** OOI is built on "COI-4.0.1+", which is a version of "Chubby Bunny", which is a preconfigured version of "SheepShaver", which is a PowerPC Classic MacOS environment that runs under other operating systems, the later all being Open Source projects. Thanks to Steven M Archer, MD of University of Michigan for advice & help in configuring this system.