Electromyography (EMG) is commonly done to diagnose extraocular muscle involvement in myasthenia gravis. I want to detect ciliary muscle movements and quantify it - is there a technique out there, or will EMG work?
I think Electromyography (EMG) is the best method to evaluate and determine the muscle activity.
The first paper measures EMG in trapezius muscle - I am looking for ciliary muscle EMG. The patent is about an accommodating IOL with ciliary muscle sensors.
Thanks for the references but they don't help my question.
It is interesting to know that you tried EMG on the ciliary muscle. Can I ask how you did it and what were the difficulties?
The first reliable electrociliografic measurements of the ciliary muscle action was described by several independent reports published in the 1950’s and 60’s (Adel, 1966; Schubert, 1955; Bornschein and Schubert, 1957; Jacobson, et al., 1958), which provided the most extensive test of this technique, concluded that electrociliografic measurements offers a “…simple technique which permits measurements of the D.C. shift in potential in the human eye that is generated in accommodation of the eye from far to near…”. We have used electrociliography in one study. It worked, but there were difficulties with the signal quality of those close-to-DC signals. For about half of our 8 subjects the signal was too noisy to be analysed (Forsman et al. 2011). The quality may be improved by performing the experiments inside electrically shielded room. Another, nearby, technique for recording accommodation is to use the impedance of the ciliary muscle. The technique is called impedance cyclography (ICG) and was introduced by Swegmark and Olsson (University of Göteborg and Chalmers; 1968). They found a superior signal-to-noise ratio, and successfully measured accommodation for subjects of different ages (Swegmark, 1969).
Good luck!
Hans
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