That is neat. Thanks for sharing! -------------------------------------------------------------------------------- BTW, I had a discussion with a family member once about 'Perfect vision", we found this interesting.. 20/20 vision is considered normal visual acuity, but it is not perfect vision. What 20/20 Vision Means Having 20/20 vision means you can see at 20 feet what an average person with normal eyesight can see at the same distance. It is a standard measure of visual acuity, which assesses the sharpness or clarity of your vision using an eye chart, typically the Snellen chart. The first number (20) represents the distance from the chart, while the second number indicates the distance at which a person with normal vision can read the same line. Why 20/20 Is Not Perfect While 20/20 is the benchmark for normal vision, it does not represent the best possible eyesight. Some individuals have better visual acuity, such as 20/15 or 20/10, meaning they can see at 20 feet what most people would need to be 15 or 10 feet away to see clearly. These levels of vision are sharper than average and are often seen in athletes or pilots, where exceptional clarity provides a competitive advantage. Prevalence and Correction Only about 35% of adults naturally have 20/20 vision without corrective lenses, while modern vision correction allows roughly 75% of adults to achieve 20/20 vision or better. Glasses, contact lenses, or eye surgery can help people reach this standard, but achieving 20/20 does not guarantee perfect overall vision. Other Factors in Eye Health Visual acuity is just one aspect of eye health. Peripheral vision, depth perception, color vision, contrast sensitivity, and eye coordination also contribute to overall visual performance. Therefore, someone with 20/20 vision may still have limitations in these other areas. Summary 20/20 vision is a measure of normal sharpness, not the pinnacle of human eyesight. True "perfect" vision would include not only excellent acuity but also optimal performance in all other visual functions. People with 20/15 or 20/10 vision have sharper-than-average eyesight, demonstrating that 20/20 is a baseline rather than the maximum standard.
