What is 20/20 Vision?
Most of us have heard the term “20/20 vision” being used in reference to healthy, normal eyesight. Perhaps you have been told you have 20/20 vision, 20/40 vision, or even 20/15 vision. As a measurement of visual acuity, 20/20 vision is considered “good” vision. Most people, however, are unaware or have forgotten exactly what these numbers mean. Let us take a quick look at the meaning behind these figures.
Anyone who has undergone a physical examination at a doctor’s office or a comprehensive eye exam at an eye clinic has seen what is called a “Snellen chart.” This is the chart hanging on the doctor’s wall with the large “E” printed at the top. This chart has been used since the late 1800’s to measure an individual’s visual acuity. Many modern eye clinics and family physicians use an electronic “viewfinder” version of the Snellen chart, but the ratios and results are the same.
Standing 20 feet from the chart, you are asked to cover one eye and read the characters on the chart. If you have 20/20 vision, then you are able to accurately read from 20 feet what someone with normal vision can read from 20 feet. Someone with 20/40 vision is able to see at 20 feet what someone with normal vision would be able to see at 40 feet, and so on.
This visual test only measures visual acuity and cannot sufficiently account for the quality of a person’s vision. Other tests are necessary to determine an individual’s ability to see color and contrast, for example. In other words, 20/20 vision is only one component of normal vision.
A comprehensive eye examination by a certified ophthalmologist or optometrist will measure both the acuity and quality of your vision, as well as help determine whether you have other eye conditions.
A Guide to Fast Food Nutrition, it is not a Myth
Fast food is convenient and tasty and is perfect for those us who work long hours, spend endless hours in traffic and sometimes even have to bring office work home. This leaves us little time for cooking a gourmet meal on a daily basis.
Most fast food is fried and contains trans fat, which, in turn, increases your weight, bad cholesterol and, thus, your risks to heart and other serious diseases. The normal daily calorie intake for an average adult female is approximately 2000 calories and for an average male 2500; one fast food meal contains generally much more than that, which in turn means that whatever you have consumed during the day besides the fast food meal will be excess calories.Most fast food is deep fried or contains other side dishes such as fries, biscuits with butter (which has trans fat), starchy foods such as mash potatoes or any pupates, which will only serve your hunger from two to four hours after, which you will start craving food again.
Fast food nutrition can be regulated by you if you choose to do so, for example, if you have a grilled chicken sandwich instead of the fried version and replace the fries with a salad or fruit instead. All fast food restaurants are now required to carry fast food nutrition facts. All you have to do is ask. That way, you can better regulate what you’re taking into your body. So, yes, fast food can be as healthy as you make it for there are options now that allow us to look up the fast food facts and, thus, ensure we don’t eat what can be bad for our body and health.Helpful TipEverybody loves fast food and restricting yourself from it will only make you crave it more in turn; you can instead try and follow the fast food nutrition facts and cut down on the portion sizes as well as choose the fast food that is healthy and tasty as well.