A great way to retrain your eyes, or to check and see if you have either Left/Right Side Neglect, Blind Spots or to practice scanning your surroundings is to buy a Word Search Puzzle Book at the Dollar Store or Walmart.
First, on page 1, pick a letter, any letter, now look at the page, cross out every one of those letters you see.
Have someone check to see how many letters you missed. Put the date and how many letters you missed, at the top of the page. That is day 1.
Repeat this exercise everyday until your number of letters you missed is near zero.
You will be amazed how much you will improve, if you keep practicing everyday, or several times a day.
If it gets to easy, turn the book sideways or upside down. That will force your Brain to look at things differently.
Rehab doesn't have to be expensive, it just has to be persistent.