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Kevin E. Houston, Matteo Tomasi, Michael Yoon, Eleftherios I. Paschalis; A Prototype External Magnetic Eyelid Device for Blepharoptosis. Trans. Vis. Sci. Tech. 2014;3(6):9. doi: https://doi.org/10.1167/tvst.3.6.9.
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To test a prototype magnet system (magnetic levator prosthesis) for the ability to comfortably and non-invasively provide eye opening with maintenance of the blink in people with paralytic ptosis and determine preliminary efficacy for short-term clinical application.
The prototype device consisted of a magnet on a spectacle frame and a micro-magnet array mounted externally on the eyelid. Participants with unilateral CN III palsy (n=3) trialed the predicate (ptosis crutch) and magnet device. Video analysis was used to quantify changes in eyelid opening and subjective responses were documented with a rating scale. A 20-minute and then a 1-week trial were offered.
The magnetic levator prosthesis device was effective to provide eye opening while allowing, at minimum, a volitional blink without ill effects on the eyelid skin or ocular surface. Comfort scores ranged from 6 to 9 out of 10 over 3 evaluations. All patients chose an extended trial of the magnet device and reported continued 8-9/10 comfort and efficacy after the extended 1-week trial.
Comfortable and effective restoration of eye opening with maintenance of the blink is feasible using external static magnets and warrants further study.
Translational Relevance: :
This is the first careful documentation of the successful use of an externally mounted static magnet system to treat paralytic ptosis.
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