Eyelash loss but thyroid is normal

There can be a few different reasons for eyelash loss. I recommend getting a formal evaluation with a hair loss expert. A combination approach of Viviscal with Latisse and PRP can help improve the growth rate of the lashes. See an expert. Best, Dr. Emer

There are about 30 reasons for eyelash loss. A physician would need your whole story and to see the eyelashes up close. If your eyebrows and scalp hair are unaffected, a ferritin of 16 is probably not relevant. But see your dermatologist or hair loss specialist if you are worried. Most people with eyelash loss have normal blood tests.

Definitely see a dermatologist about this one.  There are too many reasons why you might be losing your eyelashes to trust this question to an internet reply.  Lots of treatments exist - but you need a diagnosis first from a qualified medical professional!
Good Luck!