PUZZLE TIME !!

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123456
Across
  1. 1. Made of plastic or glass which can be bi, tri or multifocal
  2. 3. Ability to see
  3. 5. Examination to assess vision
  4. 6. Pair of lenses in a frame.
Down
  1. 2. Synonym of a pair of glasses
  2. 4. Also known as lens maker