  We propose a theory based on the $A_5$ discrete group which successfully
accounts for lepton masses and mixings. In the proposed model, the neutrino
masses arise from an inverse seesaw mechanism. The leptonic mixing consists in
a perturbed golden ratio mixing pattern with a strong correlation arising
between the leptonic mixing observables, which can be expressed as
$\theta_{13}$ predicting the other mixing angles and the Dirac CP phase.
