the ishara(spelling?) test has been proven inaccurate.
the magnant\peg test from eye doctor is "the" test.
border patrol\navy are jus 2 major agencies that allow you to use results of said test to override failed ishara test.
it costs @$100 from eye dr.
ive been thru all that.
failed several ishara charts(brown\green) but passed the magnet, color spectrum test twice, easily.
that said, i wouldnt trust myself w\red brown green wire work under water!