In this visual illusion picture, a phone is hidden in plain sight. Only the sharpest eyes can spot the hidden phone in 5 ...

In the United States, the visual acuity test is based on a measurement of 20 feet ... If you don't wear glasses or contacts, you should have at least one baseline eye exam by age 40. If you wear ...

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Optotype acuity is the measurement of a person's ability to see fine details and distinguish between different visual elements, like the letters O and Q. An eye chart is used to measure how well a ...