What is the astigmatic mirror?
Is an indispensible tool for eliminating astigmatism. Send the following program to a postscript printer. ——%<--------cut here ------------------------------------ /ZZ { 0 30 moveto 0 250 rlineto 4 setlinewidth stroke } def gsave 300 400 translate 40 -1 0 { ZZ 10 rotate } for showpage grestore ------%<--------cut here ------------------------------------ If you dont have access to a postscript printer, then follow these instructions, else skip over the next paragraph. You will need an A4 sheet of paper, a ruler, a protractor, a compass, a pencil and a 0.2mm black marker. Find the center of the paper, and using a pencil draw a circle almost as large as the paper (diameter 20cm) wiht the center of the circle at the center of the paper. draw another smaller circle from the same central point about radius 1cm. Then draw a line cutting the large cirle in two, but not crossing over the inner small circle. ie Leave the inner small circle blank. Then divide the two pies you have in two aga
