La Mer has desperately needed an eye serum for what seems like an eternity. Unfortunately, this isn't it. I initially purchased The Illuminating Eye Gel for use under The Eye Concentrate, as a serum of sorts. Out of curiosity, I began to ask La Mer specialists at multiple stores, from Nordstrom to Barneys, all of whom informed me that the gel had not been created or tested for use as a serum or under with The Eye Balm Intense or The Eye Concentrate. Worse still, they didn't recommend combining the two. I want as far as to call La Mer corporate, where the information I received from every store was confirmed.
Used alone, I really don't see the benefit of this eye gel. Sure, there is a mild cosmetic brightening effect. But the results are temporary and frankly aren't that significant. La Prairie's Cellular Radiance Eye Cream is a good 10x as luminous, hydrates better, and is also preventative.
I recommend sticking with one of La Mer's two eye treatments, or switching to La Prairie's Cellular Radiance Eye Cream for brighter eyes during the day. At night, simply use one of the eye treatments. I really wish La Mer would bite the bullet and finally put out a genuine eye serum. Until then, I'm returning this product after two weeks of use and mixing things up. 2.5 stars.