Tarigan, Nanarita. “The Relationship Between Knowledge and Anxiety Levels in Preoperative Cataract Surgery Patients at the Eye Clinic, Dr. Rom. Djoelham Binjai 2022”. Science Midwifery, vol. 10, no. 2, Apr. 2022, pp. 1926-31, doi:10.35335/midwifery.v10i2.584.