Pengaruh Injeksi Ropivakain 0,75% Subtenon Dengan Kombinasi Anestesi Umum Terhadap Kejadian Refleks Okulokardiak Saat Operasi Strabismus dan Nyeri Pasca Operasi = Effects of Sub-Tenon Ropivacaine Block in Combination with General Anesthesia on Oculocardiac Reflex during Strabismus Surgery and Postoperative Pain