In short, because you look like you’ve been on a three-day bender during your 9am stand-up every morning. Eye serums are all about feeding the skin and, because they're lighter than creams, are better equipped to target finer lines, puffiness and dark circles. That's because they're more easily absorbed, so the high-potency ingredients get further down the skin's layers than a moisturiser ever could. It also means there's less product residue left behind on the skin's surface. Is dishing out dollars on eye creams worth it? We ask make up for ever step 1 primer experts what works and what doesn't for pesky wrinkles, dark circles, and bags around our eyes. The reason for this is simple. “The skin of the eyelids is thinner, drier, and more sensitive to irritation than the oil-rich skin of the face,” says Corey L. Hartman, MD, a dermatologist in Birmingham, Alabama. “Therefore, it is more likely to benefit from intense active ingredients due to its predilection to premature aging.” One might wonder if a face cream couldn’t do the same job. But a moisturizer, however potent, isn’t the ideal replacement, as the ingredients often found in facial products could potentially irritate that fragile skin. Such all-over usage could exacerbate rather than solve problems, Hartman explains.