A 62-year-old woman from Mumbai with recently diagnosed primary open-angle glaucoma (open angles confirmed on gonioscopy, IOP 26 mmHg, early glaucomatous visual field defect) has been started on topical timolol 0.5% twice daily. After 4 weeks, IOP remains 24 mmHg in both eyes. Visual fields show no progression. She tolerates the medication well with no systemic side effects. What is the most appropriate next step in management?

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