OCT Vibrography for Biomechanical Properties of Tissues

The overall goal of this study is to develop OCT Vibrography (aka OCT elastography) as a novel tool for measuring biomechanical properties of human tissues in vivo.

Group 1: Inclusion criteria: • Subjects with healthy eyes (age 18 - 75, N = 50) Exclusion criteria: * Subjects with history of eye diseases, and previous eye surgeries. * Subjects with diabetes, glaucoma family history * Subjects allergic to anesthetic eyedrop, especially proparacaine * Subjects with severe allergy * Subjects who have difficulty biting * Subjects who have recurrent corneal erosion Group 2: Inclusion criteria: • Subjects with healthy skin (age 18 - 75, N = 10) Exclusion criteria: • Subjects with open cuts/sores on the skin, skin infection, or any contagious skin condition Group 3: Inclusion criteria: • Subjects with healthy gingiva (age 18 - 75, N = 10) Exclusion criteria: • Subjects with open cuts/sores on the gingiva, gingiva infection, or any contagious gingiva condition Group 4: Inclusion criteria: • Mild or moderate keratoconus subjects (age 18 - 40, N = 20) Exclusion criteria: • Subjects with K-max above 60 diopters (Pentacam imaging) are excluded