These are two different things.Revitalash is an eyelash conditioner that claims to make your lashes appear fuller, (think conditioner for your hair). It is not a medicine. It does not have FDA approval. As of this writing, there are no clinical, scientific trials published in a peer reviewed medical journal.Latisse consists of an established medicine that has been used for years to treat glacoma. They found some glaucoma patients had significant eyelash growth. Allergan configured it to be a topical medicine for eyelash growth. They went through the rigors of FDA approval. The science says that it keeps the lashes in growth phase. Clinical trials showed that it can lengthen eyelashes 25% and thicken them 106%, later with more use, and will darken them. There was some reports that with the eye drops, if you had hazel eyes with brown spots, the brown spots may get more brown. It should not change your blue eyes. as of this writing, there has been no color changes when using latisse.