Thu Nguyen practices optometry in Chula Vista at the Castillejos Eye Institute on F Street, a Scripps-affiliated multi-specialty eye care group that has operated from the 342 F Street campus since the institute's founding. The practice's glaucoma management protocols — including gonioscopy, tonometry, and visual field monitoring — coordinate with systemic-disease specialists such as Cardiovascular Institute of San Diego when hypertensive or diabetic comorbidities contribute to optic nerve damage. Clinical services in French expand the institute's multilingual capacity beyond the Spanish already spoken by the ophthalmology team at the same F Street location. Slit-lamp biomicroscopy, dilated fundus examinations, and digital retinal imaging support detection of meibomian gland dysfunction, open-angle glaucoma, and diabetic retinopathy at each comprehensive evaluation. Prescription fulfillment for topical prostaglandin analogs, beta-blockers, and combination glaucoma drops routes through nearby independents including Sunrise Pharmacy for patients managing multi-drop regimens. Automated perimetry maps scotoma patterns across 76 test points in the central 30-degree visual field, quantifying progression rates that guide threshold adjustments in therapeutic protocols.