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 ...
Optometrist Linda Morgan uses a phoropter to help determine a prescription for Liberty Elementary School student Brooklyn Richotte, 12, during a week-long vision screening at the UNMC College of ...
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