Impaired vision and blindness are common. About 3.4 million people in the US are blind or visually impaired. Vision is usually measured by visual acuity charts, and normal vision is expressed as 20/20 ...

Glaucoma is a silent eye disease that damages the optic nerve and can cause permanent vision loss without early warning signs ...

Caring for your eyes and vision are important parts of a healthy lifestyle. Vision screening is a simple test of your vision that can detect problems early. An eye exam is a detailed check of your ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. An inscription reads “SEITZ TEST ...