The SEC has required companies to report EPS (earnings per share) on both an outstanding share and a diluted share basis for the past few years. This takes into account the number of "in the money" unexercized options.
So, I would think that if EPS was, say $1.00, and diluted EPS was, say $.90, off by 10%, that would give an investor some indication of the relative impact of expensing options.