Myasthenia Gravis Support Group
Myasthenia gravis (MG) is a neuromuscular disease leading to fluctuating muscle weakness and fatiguability. The hallmark of myasthenia gravis is muscle weakness that increases during periods of activity and improves after periods of rest. Although myasthenia gravis may affect any voluntary muscle, muscles that control eye and eyelid movement, facial expression, and...
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http://www.qualityoptician.com/home/ptosis.html
I had not heard of them before and find the concept fascinating. I can see how they could be helpful. I had only heard of prism lenses which help with double vision.
Hope this helps! Marie