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Orbit™ 1.8

Software & Documentation

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.

Download a version of Orbit™ 1.8 that functions in "demonstration mode", operating normally, except that output functions (saving, exporting and printing) are disabled. You will find this functionality sufficient for most purposes. It had previously been possible to purchase a license removing these restrictions, however, we stopped selling licenses because: [1] we have not updated Orbit for Mac OS-X, and it must be run, somewhat clumsily, in "Classic mode" (Note: the new Intel Macs do not support Classic mode), [2] the "automatic parameter fitting" function does not work in Classic mode, and [3] "active pulleys" are not included in the model.

Nevertheless, Orbit 1.8™ remains the best existing model of extraocular biomechanics & strabismus, and is still widely used (see below). We had hoped that SEE++ would replace Orbit 1.8™, provided UAR with our source code, and worked with them to this end. However, despite it's modern program structure and fine graphics, SEE++ (specifically, the version current in 2005) does not contain a correctly implemented biomechanical model.

Three kinds of online help are available within Orbit. Launch Orbit and read the explanatory documents in the Guide Menu . Click 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.

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.

	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.
	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.