Phacoemulsification combined with High-Frequency Deep Sclerotomy (HDFS) in Primary Open Angle Glaucoma Patients in DR. Achmad Mochtar Bukittinggi Hospital: Oral Presentation - Observational Study - Ophthalmologist (The Indonesian Ophthalmologists Association (IOA, Perhimpunan Dokter Spesialis Mata Indonesia (Perdami)), 2023)