They work
Having given prism glasses to my mother many years ago because I had seen them at the optometrist's store, I knew of the assistance they could give. I could no longer find them anywhere and some stores did not know they exist!  Turning to Amazon, I found an array of possibilities and chose two. When they came, I chose these to give to the patient who needs them because the reviews seemed so positive.  She is happy with them, too.
Rating: 5 stars