An Eyesight Test How Often Should You Have One?
An Eyesight Test is the first thing you should do to protect your eyesight. It is possible to have a serious vision problem and not know it. Vision problems that are left undetected and untreated may lead to vision loss and in some cases blindness. Early detection is the key to minimizing vision loss. In general, the recommended frequency of comprehensive eye examinations for people without symptoms or special risk factors is: Age
As one of the most sensitive organs of the human body, the eye is prone to risk. Natural aging, disease and injury may contribute to eyesight deterioration in one person. Doctors suggest that ordinary people should visit an ophthalmologist to get a complete eyesight test exam at least every three years.
The key point is to detect and diagnose these diseases at an early stage. Without early detection, some eye diseases can lead to fatal results such as permanent impairment and even absolute blindness. However, visionary dysfunctions may not have predominant symptoms, so that ordinary people in most cases can not realize an eye disorder. In these cases, regular eye examinations from an ophthalmologist are quite essential. Those eyesight tests can evaluate colorblindness, visual accuracy and peripheral vision. In some cases, other diseases such as high blood sugar and high blood pressure can be unexpectedly diagnosed. Most people know that there is a basic eyesight test which requires a patient to read alphabets on a chart. This popular test can be used to detect visual abnormalities. Alphabets in the bottom of the chart are the smallest and those myopic patients can only read larger alphabets in higher lines. Several groups are also particularly required to have regular check-ups.
Professionals like drivers and software analysts always strain their eyes for 10 to 12 hours every day. Their eyes are surely more likely to suffer visual problems. People wearing eyeglasses or contact lenses also need regular doctor's visits, in order to get prescription check or update. By looking at lots of people, eye doctors have decided what a "normal" human being should be able to see when standing 20 feet away from an eye chart. If you have 20/20 vision, it means that when you stand 20 feet away from the chart you can see what the "normal" human being can see. (In metric, the standard is 6 meters and it's called 6/6 vision). In other words, your vision is "normal" -- most people can see what you see at 20 feet.
What you will need:
Note About Printers: This test requires you to print the HOTV chart. The appearance of your printed chart may vary depending on the printer you are using. We have provided a one inch scale reference at the bottom of the chart. In order to get valid eye test results, the scale square should be one inch. Please measure to make sure. Instructions 1. Click here to Print the HOTV chart, or right-click to download it.(You will need Adobe Reader to print the eye chart. Adobe Reader is a free program. If you do not have it installed on your computer. 2. Tape the first page of the chart to a bare wall with no windows. The chart should be at your eye level. 3. Measure 10 feet away and place a strip of masking tape on the floor. Stand with your heels on the tape. 4. If you already have glasses for distance vision, wear them during the test. 5. Hold the cup over your left eye. 6. Read each of the letters from left to right starting with the largest line. Have your assistant write down the letters that you read. If you don't have an assistant, you should write the letters as you see them. 7. Continue moving through the chart to the smallest letter you are able to read with the right eye. 8. Check what you wrote down. You pass a line when you can correctly read at least 3 out of 5 letters. 9. Write down the lowest line on the chart that you passed. 10. Repeat the same steps with the right eye covered. 11. Write down the lowest line on the chart that you passed with your left eye. What the results mean Adults should be able to read the 20/40 line with each eye. If you did not pass the test, we recommend that you see an eye doctor for a complete eyesight test exam.
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