ERANCE section of the reference manual before you
run this lesson and look up each command as you enter it. This is a
simple example. The power and flexibility of the tolerance analysis is
superior to most other commercial optical design programs.</p>

<p>
  <strong>LIB GET 1</strong> ( GETS LIBRARY 1 LENS INTO THE CURRENT LENS)<br>
    RESTORED LIBRARY LENS NO.  1<br>
    (THE NEXT THREE COMMANDS SET UP COMPENSATOR VARIABLES)<br>
    <strong>COMPVAR</strong><br>
    <strong>TH 1 8</strong> (Compensator 1 i