I returned it because I expected it to help me read an entire page faster than I can with a hand held magnifier. It did not and in fact it made reading a page more difficult because it was hard for me to steady it enough even using both hands to focus evenly on the text.
Impractical for me... Returning it. (Have to hold to get best effect!) Great idea but when I need to use it generally for "document" and takes "time" fully evaluate docs... Considering "Mag Light"!