After blepharoplasty lashes seem to stick straight out (no curl)?

My blepharoplasty was 4 yrs ago and prior to the surgery my lashes curled up and when I put mascara on my lashes they were very visible. Now the lashes seem to stick straight "out" (no curl) and no matter how much mascara I put on or even if I use a lash curler, the lashes cannot be seen. It looks like I do not have any lashes or even mascara on. Is there a product I should use to get the curl back or a particular brand of mascara that will give some curl to my lashes? Thank you.