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.
The examination will assess visual acuity, color vision, peripheral vision, eye movements, and the appearance of the retina and optic nerve (by looking at the back of the eye). To check peripheral vision, an automated test is commonly used, in which the patient pushes a button every time a flash of light is seen.