What is 20/20 – a perfect vision for 2020 - Binyon Vision

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A Dutch ophthalmologist, Dr. Herman Snellen, developed the 20/20 measurement system for visual acuity in 1862. Could he even have dreamed that 158 years later optometrists all over the US would be doing a happy dance that the year 2020 is going to be their year. What is 20/20 vision? In the Snellen measurement system

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