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A quarter of a century has passed since the observing technique of integralfield spectroscopy (IFS) was first applied to planetary nebulae (PNe). Progressafter the early experiments was relatively slow, mainly because of the limitedfield-of-view (FoV) of first generation instruments.With the advent of MUSE atthe ESO Very Large Telescope, this situation has changed. MUSE is a widefield-of-view, high angular resolution, one-octave spanning optical integralfield spectrograph with high throughput. Its major science mission has enabledan unprecedented sensitive search for Ly{\alpha} emitting galaxies at redshiftup to z=6.5. This unique property can be utilized for faint objects at lowredshift as well. It has been demonstrated that MUSE is an ideal instrument todetect and measure extragalactic PNe with high photometric accuracy down tovery faint magnitudes out to distances of 30 Mpc, even within high surfacebrightness regions of their host galaxies. When coupled with a differentialemission line filtering (DELF) technique, MUSE becomes far superior toconventional narrow-band imaging, and therefore MUSE is ideal for accuratePlanetary Nebula Luminosity Function (PNLF) distance determinations. MUSEenables the PNLF to become a competitive tool for an independent measure of theHubble constant, and stellar population studies of the host galaxies thatpresent a sufficiently large number of PNe.

Integral Field Spectroscopy: a disruptive innovation for observations of Planetary Nebulae and the PNLF