Simulating visual acuity. The purpose of this page is to give an idea of how blurry your vision is when you don't use your glasses or contact lenses, or when you use a prescription which doesn't match your eyes. This is illustrated by simulating the blurry perception of a Snellen eye chart, which is commonly used to make eye examinations.
A SCAI answered. Fasting for 9 to 12 hours before a cholesterol blood test ensures accuracy in the test. It helps make sure your body does not have extra sources of fat - say, from the ice cream you had for dessert - that could alter the test results.
Do you have to fast before a blood test at an annual physical? kgb answers Â» Health & Body Â» Health & Fitness Â» Do you have to fast before a blood test at an annual physical? Not Medical Advice: The foods that you eat can affect blood cholesterol test readings in the short term. For this reason you will need to fast. Top 10 questions Health & Fitness.