When you master a hidden object scene of Iris's Eyes, you will receive a Badge Boost that doubles your badge progress when you win any regular hidden object scene. Once you have received the Badge Boost, it will double the badge progress of the next 10 rounds you play.

When you play a scene, a popup will notify you that the booster is activated.

The Badge bonus does not expire so don't worry if you don't have any energy at the moment.