A free app for Android, by Learn Piano Letter Notes Team.

This is a free application that helps you measure your myopia, or how much you have farsightedness or nearsightedness.

To use the app, you need to be able to read and write in Vietnamese.

First, download this application on your mobile device. Next, when you open the application, you need to choose from the options of eye measurement.

There are two options for you to choose from: the first option is to use the standard Golovin Sivtsev visual acuity chart, and the second option is to use the Snellen eye test.

After that, you need to tap the “Eye exam” button, then you will be able to see the results.