Not all surgeons have you put anything on your stitches after eyelid surgery. If the stitches are getting dry or tight you could consider applying antibiotic ointment in a thin layer over them. Opthamolic antibiotic ointment would be best, but even Neosporin would be okay. Keeping the eyes clean and gentle washing with soap and water, and using natural tears in the eyes can also help to prevent that tight feeling and promote healing. Vaseline is really not a great choice for a topical moisturizer - it is petroleum-based and makes things greasy, but does not actually moisturize or hydrate the skin. It is probably best to contact your surgeon for his/her specific recommendations on this issue, as they would know the details of what was done and the type of technique of sutures that you have in.