Glaucoma sub-specialty NPI taxonomy 207WX0009X anchors Vision Specialists of California, operating as Khan Vision Specialists under owner Dr. Fahad H. Khan, MD on Lewis Street near Mercy Hospital, and the Asian-owned and women-owned practice focuses on minimally invasive glaucoma surgery (MIGS), cataract extraction with IOL implantation, and comprehensive medical eye exams. Complex retina referrals are routed to subspecialists such as Kelly S. Keefe, MD, Inc. when posterior-segment management is required. Free Friday community clinics and biennial ophthalmic mission trips to underserved nations including Mexico, India, and Bangladesh form the practice's charitable arm. Orbital and optic-nerve imaging beyond the in-office OCT is coordinated through Imaging Healthcare Specialists - Hillcrest for MRI and CT studies. The most complex appointments combine OCT optic-nerve and retinal nerve fiber layer analysis, visual field perimetry, and gonioscopy to stage glaucoma severity and plan a MIGS surgical pathway.