Having 20/20 vision is usually what people think of as the measurement for perfect vision. However, it’s simply a measure of your eyesight, it does not really mean “perfect vision”. The term 20/20 is a measurement: The 20/20 is what the estimated perfect acuity of someone is at 20 feet. For instance, if you have 20/100 vision, you can see what a person with 20/20 vision can see at 100 feet.
The color of the image can also play a big role in how well you see something. Some of the words in these images might be visible to some people and not for others. Give them a try and see in which words are difficult for you to see.
