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.
A triglyceride test is a fasting blood test. 1  You can't eat anything for a period between 12 and 14 hours prior to testing. 2  Water is the only beverage that you may consume while fasting. 3  You'll need to fast the night before and take the test the first thing in the morning to get an accurate reading. cholesterol test is a fasting blood test. 1  You will have to refrain from eating or drinking anything other than water for a period between 9 and 12 hours before the test. 2  You will need to bring a record of every food and beverage you have consumed for the week prior to testing with you for the doctor to review.