Rated 1 out of 5 stars

What utter nonsense, this addon will actually do the opposite of what it claims. Think about it - what happens if you strain your eyes on a regular basis? Over a matter of time your eyesight worsens and you end up wearing glasses. You CAN'T improve your eyesight by regularly straining your eyes (Nintendo were forced to admit as much with their 'eye training' DS game).
If you could don't you thing opticians would recommend 'eye training' instead of glasses!

This review is for a previous version of the add-on (0.04). 

confusing descriptions [fixed]

Yes, the expression "Everyday training improves eyesight." was potentially misleading. Thank you for your explanation of the wrong understanding. The extension's descriptions have been updated.