Program Description



The Eyemodel program is sold as a 30 day free trail downloadable program for PCs only.  If after that trial period you wish to purchase the product please come back to this site and do so.  There is no need to re-install the program after the trial period, an unlock key will be emailed to you which will unlock the program for a lifetime's use.


About the program


The Eyemodel program is designed to teach the principles of eye movement physiology and to test various surgical scenarios on virtual strabismus cases.

It can also be used as a database for real patients in the strabismus clinic and to test the results of surgical manoeuvres on those patients.


By inputting the results of real surgical cases and comparing the results obtained with those predicted by the computer model, an audit of actual over anticipated results can be obtained.


Eyemodel development synopsis


The mathematical model underlying the Eyemodel program was originally formulated by Robinson [1] in the late 1970ís.  Robinsonís is a monocular model that allows for 3-dimensional rotation of the eyeball and determines the equilibrium force balance due to the correlated action of the six extraocular muscles. A later refinement by France and Burbank [2] produced a binocular model that required iterating the Robinson calculations of the left and right eye to account for the motion coupling of the two eyes.  Performing these calculations for a range of fixating eye positions is computationally intensive and, at that time, was only possible using Research Department computing facilities.


In the early 1990ís, with the increasing power and wide availability of PCís, Larry Benjamin, a Consultant Ophthalmologist at Stoke Mandeville Hospital (UK), conceived of the idea of creating the Eyemodel as a more accessible program which could be used as an interactive tool for teaching and analysing strabismus, and predicting the effects of corrective surgery on ocular motility. The Eyemodel implementation of the France and Burbank/Robinson models was carried out by Gerard Corrigan, whilst with Tessella Support Services plc, and more recently with Singular IT Limited.


Gerard graduated from Oxford with a BA (Hons) in physics in 1980, and a D.Phil (Oxon) in the field of High Energy Nuclear Physics in 1983. He has over 25 years experience in variety of problems mathematical modelling and computational physics, and has worked at world leading laboratories in their fields (CERN, Fermilab and JET). He is currently employed as a Senior Computational Physicist at the Joint European Torus (JET) laboratory in the UK, where he develops computer models to simulate the behaviour of Thermonuclear Fusion Reactors.


Through the combined experience and efforts of Larry and Gerard, Eyemodel developments have continued to keep pace with increasing computer power. Nowadays, many cases can be analysed, simulated and compared with surgical results through a user-friendly graphical interface in a matter of seconds.



[1] Robinson, D.A. (1975). A quantitative analysis of extraocular muscle cooperation and squint. 

Invest. Ophthal. 14, 801-825


[2] France, T.D. and Burbank, D.P. (1978). A computerised model of human ocular movements.

Strabismus Proc. 3rd Meeting of the Int. Strabismological Assoc.

pp 429 Ė442. Grune & Stratton, New York