Growing evidence shows that altered blood flow plays a major role in many vision-threatening diseases including glaucoma, diabetic retinopathy, age-related macular degeneration, Central Retinal Vein Occlusion, and Branch Retinal Vein Occlusion. Optical coherence tomography, an established imaging technique use for eye exam in clinical ophthalmology, provides high-resolution cross sectional images of the retina and has increased our ability to understand many eye diseases.

Optical Coherence Tomography is a non-invasive technique use a broadband light source to illuminate the area of study with light in the near infrared spectrum, then obtains static images of tissue structure from interference signals of the back-reflected light.

Optical Coherence Tomography a non-contact, non-invasive means of documenting both tissue structure and blood flow changes in ocular disease and can provide high resolution cross-sectional images of tissue structure, direct visualization of blood flow in blood vessels of the eye.

Inclusion Criteria:

• Adult 18 years and older with normal eye, or has been diagnosed with eye disease.

Exclusion Criteria:

• Less than 18 years of age.

Primary care clinic and community sample.