An E-Ink screen doesn't have a front panel. The surface is the E-Ink layer. Unless it's a front-lit model, in which case there is a thin light guide layer in front of it. But, as far as I know, these are still all essentially plastic.
I doubt that retro-fitting a glass protector in front of the screen will help to protect the back-plane, which seem to be most vulnerable to point pressure and torsion stress, rather than side impact.
I'm still hoping that we'll see E-Ink screens in mainstream devices with metal or plastic backplanes at some point, which will probably make the screen the most robust bit of the ereader..
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