A 52-year-old Indian woman is referred to the glaucoma clinic after a routine eye check-up at an optical shop revealed elevated intraocular pressure. She is completely asymptomatic with no visual complaints. On examination, IOP is 28 mmHg in the right eye and 26 mmHg in the left eye. Gonioscopy shows Shaffer grade 3 angles bilaterally with normal trabecular meshwork. Optic disc photographs show a horizontal cup-to-disc ratio of 0.5 with intact neuroretinal rims, no pallor, and no disc hemorrhages. Automated perimetry (24-2 SITA Standard) is normal in both eyes. What is the diagnosis?