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A comment on Tunable eyeglass lenses to replace bifocals. Parent comment

Re:Tunable eyeglass lenses to replace bifocals by maxerickson on Sunday February 05, 2017 @10:48AM (#13572850)
Based on Their clunky prototype—sleeker versions are in the works—is based on an infrared distance meter built into the bridge of the frames. I think head movement is required.

If it used pupil tracking to determine where the wearer was looking it wouldn't required head tracking, but it sounds like the focus is set based on what is in front of the distance sensor.

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Re:Tunable eyeglass lenses to replace bifocals by throwanem on Monday February 06, 2017 @08:06AM (#13579056)
That's the point I'm making. The clever adjustable lenses require head movement. My boring old bifocals do not.
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