A single episode of Latisse into the eye will not damage your eye. There have been rare reported cases of darkening of the iris with prolonged use. THis drug was actually used for glaucoma and the noted side effect was longer eyelashes and that is how it came to be a cosmetic treatment.
Latisse is approved by the FDA for patients ages 18 years and older. Since your daughter is 15, technically she is not able to receive the treatment. I would suggest waiting until the recommended age to undergo Latisse.
To maintain the effects of Latisse - longer, thicker, darker eyelashes - you need to continue using the product. Although the manufacturer recommends continued daily use of Latisse, most patients will be able to maintain what they have gained with use of the product two to three times per...