Pei Chain provides optometric care in Chula Vista's Third Avenue Village district from Castillejos Eye Institute, a ten-physician ophthalmology and optometry center at 342 F Street. The co-located model allows same-facility referrals between optometric refraction and surgical ophthalmology, a vertically integrated approach that mirrors the multi-discipline structure at West Dermatology Chula Vista for conditions involving periorbital skin and eyelid pathology. Exams cover prescription updates, contact-lens evaluations, and screening for cataracts, glaucoma, and macular degeneration across a patient base served in English, French, Italian, Portuguese, Spanish, and Tagalog. The downtown F Street location places the practice near Chula Vista's medical services corridor, where post-surgical rehabilitation and vestibular assessments connect to Sports Performance Physical Therapy - Chula Vista for vision-related balance recovery. Surgical capabilities within the institute include cataract extraction with posterior-chamber intraocular lens implantation and retinal laser photocoagulation for proliferative diabetic retinopathy.