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Text File  |  1992-09-01  |  288b  |  8 lines
  1. Poor night vision. About 20% of people have
  2. poor vision in twilight and nearly 50% in the
  3. dark. Low-luminance myopia does not show up
  4. in normal optical tests, but in 1989 a method
  5. was developed of measuring the degree of
  6. blurring by projecting images on a screen
  7. using a weak laser beam.
  8.