EFFECT OF MEMANTINE AS N-METHYL D-ASPARTATE RECEPTOR ANTAGONIST ON CASPASE-9 LEVEL OF RETINAL GANGLION CELL IN METHANOL TOXIC OPTIC NEUROPATHY RAT MODEL: Oral Presentation - Experimental Study - Ophthalmologist (The Indonesian Ophthalmologists Association (IOA, Perhimpunan Dokter Spesialis Mata Indonesia (Perdami)), 2023)