In this new episode on the useful web, we return to talk about health and medicine with practical tools through which it is possible to measure the sight as one would do in a visit to the ophthalmologist . Even the ophthalmologist is therefore online and after having tried the audiometric test to measure hearing, we also immediately see how to check the eyesight, both from the point of view of visual acuity and of the chromatic sense.
As can be easy to imagine, the table used by the ophthalmologist, the one with the letters or numbers randomly arranged and placed in rows that become smaller and smaller, can be downloaded and printed.
However, there is a website that allows you to do the eye exam directly online, from the computer screen with an absolutely credible method.
1) First of all, on the Wikipedia page you can download the ophthalmologist exam scoreboard with the letters lined up from the largest to the smallest.
2) The best eyesight test to do online and the most professional is that of the Zeiss website.
The Online Vision Screening tool allows you to do an eye exam looking at the computer screen. Then press the Start Check button and adjust the monitor settings according to the instructions and position yourself at a precise distance. The exam consists of 3 tests: Visual Acuity, Contrast and Colors. For each one, it is necessary to guess the right direction of the letter or symbol, showing that we are seeing each other well.
3) On the Vision.vega9.com web page there is a flash web application that contains the Snellen or E board with different letters every time the page is reloaded. To use the ophthalmologist's table effectively on the computer screen, you need to press the " information and instructions " button and follow these instructions:
- Do not keep the brightness too high.
- Stand with your eyes exactly in front of the monitor.
- Take a credit card type card, place it on the screen alongside the large I and write a numerical value on the " Multiplier " field until the I is as high as the card.
Once the instrument is configured, you can start examining the view by positioning yourself 4 meters from the screen.
You can also test individual eyes by covering both and seeing up to which line you can read.
4) Another site is proposed as a virtual eye surgery and provides all the tests that can be done in a normal check-up by the ophthalmologist .
Among these are:
- Measurement of vision for adults (with letters or numbers);
- Measurement of vision for children;
- Close vision control;
- The chromatic test on colors to check if there is color blindness;
- Amsler's network that I don't know what it is for.
The only problem with this site is that the pages are static. This means that the page with the letters to be read is always the same so only the first test can be good, the other times instead the memory will help the sight and the test will not be credible.
5) On the EyeSight Simulator website there is a simulator that allows you to understand how many degrees of myopia you have. You have to enter the data of the missing degrees and you will notice how the image becomes blurred as when you look at it without glasses.
I must say that the service does not seem exactly accurate, I use glasses and by entering the data I must say that my vision seems much better than what is shown instead. But maybe it's a chance you try ...
6) As for color blindness and seeing if the eyes distinguish the colors well, you can take the Ishihara test, the one where you have to read colored numbers inside a similarly colored frame.
The best site this time is in English, Colorvisiontesting where you can take the Ishihara test in a guided way.
You have to recognize the number in 3 seconds and then click where it is written Click here for the correct answer to see if the answer is correct and move on to the next table.
To stay on topic, I remember that being too much on the computer hurts the eyes so I recommend using some computer programs that help to rest your eyesight.
