What Causes Loss Of Hair From Eyelashes Of Right Eye?

I am losing eyelashes in a large clump on my right eye only. This began one year ago. I no longer use an eyelash curler because when I do, my lashes come out. (Note: lashes on left eye are never affected by using an eyelash curler). I don t have any eye irritation and always go to bed with a clean face after bathing with an organic soap. Thank you!Elizabeth