They would be otherwise

[Maybo]

Chelsea rolls her eyes dramatically. She's wearing so much mascara around her dark brown eyes, her eyelashes are at least three times as long as they would be otherwise.

Source: The Inmate by Freida McFadden

What does “they would be otherwise” mean?

 

[tedmc]

The mascara Chelsea is wearing make her eyelashes appear three times longer than they are without it (otherwise).