Roca cape lighthouse in Portugal, West most point of Europe ( Cabo da Roca) Vertical. Roca cape lighthouse in Portugal, West most point of Europe ( Cabo da Roca) Vertical. The obelisk with a large white cross at Cabo da Roca. It is a cape which forms the westernmost extent of mainland Portugal and continental Europe.
[Read more about children's eye exams .]. 20/20 vision (or really, 20/20 visual acuity) is considered normal vision, meaning you can read at 20 feet a letter that most human beings should be able to read at 20 feet.
Blurred vision. If your vision ever changes or distorts, it could be a sign you need glasses. Test yourself by regularly looking at something you see every day, such as the spine of a book or a number plate, to check whether you can still read it. Try doing this one eye at a time for a more thorough test.