In one aspect of the invention, a trifocal ophthalmic lens is disclosed
that includes an optic having at least one optical surface, and a
plurality of diffractive zones that are disposed on a portion of that
surface about an optical axis of the optic. At least two of those
diffractive zones have different areas so as to cause broadening of
optical energy profiles at a near and a far foci of the diffractive zones
for generating an intermediate focus.