Patients ≥18 years old from ophthalmic clinics with or without glaucoma were enrolled to this respective observational clinical study. However, patients with any history of eye surgery (except cataract surgery) including laser procedure were excluded. The investigators will review patients' medical chart and update any medical history in your medical record. If new scans are needed, investigators will do them at the time of patients' current visit and it will require about 30 mins. CASIA SS-OCT (CASIA 2) is a non-contact scan of the front of the eye with higher resolution and provides deeper, wider and three- dimensional views. It is the newest scan machine. It is not FDA-approved but is approved in many other countries including Japan for patient use. We may perform the scan in the light and dark condition. We may also perform the routine scan to capture images of the anterior part of the eye for comparison purpose. The results of the scanned data will be among patients' medical records. Age, sex and ethnicity within your medical records will also be used for the analysis.
