Latisse provides longer, thicker lashes, but potentially can lead to some iris color changes
You ask a great question. The answer appears to be that even though Latisse is applied to the eyelashes, it may be possible for a small amount to get into the eyes -- which could rarely lead to darkening of the iris. However, the risk of this happening is very low.
For example, you may know that Latisse is currently used for glaucoma. It is called Lumigan, and is given once a day. Lumigan is very effective at lowering eye pressure. However, even though glaucoma patients place a drop of...