The best replacement for definity is optison.

The best alternatives to definity are rated as following:
★★★★★  optison
★★★★★  physio
★★★  regenerist
★★  cooper tires
★★  physio enhanced
★★  varilux
★  total effects
★  olay regenerist
★  sculptress
  varilux comfort

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Speaking about definity, one probably shouldn't forget about echo.

Other search terms related to definity and their ratings are:
★★★★★ echo
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definity
optison
physio