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.
The other rows contain letters that are progressively smaller. During an eye exam, your eye doctor will ask you to find the smallest line of text letters that you can make out, and ask you to read it. If you can read the bottom row of letters, your visual acuity is very good.
Tests for Glaucoma. Glaucoma is detected through a comprehensive eye exam that includes a visual acuity test, visual field test, dilated eye exam, tonometry, and pachymetry. A visual acuity test uses an eye chart test to measure how well you see at various distances.A visual field test measures your side or peripheral vision.It helps your eye care professional tell if you have lost side vision, a sign of glaucoma. Click for more information. In a dilated eye exam, drops are placed in your eyes to widen, or dilate, the pupils.n tonometry, an instrument measures the pressure inside the eye. Numbing drops may be applied to your eye for this test. With pachymetry, a numbing drop is applied to your eye. Your eye care professional uses an ultrasonic wave instrument to measure the thickness of your cornea.