In the valley of the blind, the one-eyed man is king.
What you actually "see" with progressive glasses
The narrow field of vertical undistorted vision lets wearers of progressive glasses clearly see only a narrow vertical strip of text. Moving their head lets them move that undistorted area around the page on the screen, but the reduced peripheral vision makes it difficult to efficiently comprehend text and concepts. (Yes, the distortion below IS exaggerated to make the point more obvious.)
Requires (free) Adobe Flash to run
Provides a quantitative measure of the loss of peripheral vision
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