With regard to the quality of analyses performed using the optomechanical constraint equations, there are two considerations. The first is how well the constraint equations compare to physical theory, other computational methods such as lens design codes, and reported empirical test data. That is: How well do the equations simulate optical reality? The second consideration is: Considering all of the calculations going into the equations themselves, how can the engineer be sure that the equations as implemented are faithful to the original optical prescription?
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