How do i find out if i have a blind spot in my central vision?

Amsler gird : There is a gird with central black dot that is called amsler grid. You can down load an app, search online or ask you doc for it. You test one eye at a time look straight at the center dot and make sure you can see all the grid lines surrounding of it. You can also tell while you are reading if you are missing letters or word from the line.