For the designer: while calculating the settings of an optical device, the theory employed by this program addresses all properties and corresponding effects. For given combinations, the theory offers a set of apparently equivalent solutions. One will be able to verify the image quality, to choose the best solution and to optimize the dimensions for a chosen combination.

For the builder: The curvature and depth of a lens obtained after manufacturing is almost never exactly what was desired. After measuring the real dimensions of different lenses, the optician will input their values to the software, thus being able to verify if the precision achieved is enough and if, eventually, he can optimize the placement of the lenses in face of their real characteristics.

For the observer: Correct allows choosing the best eyepiece for a given instrument. A few simulations will show that eyepieces are the most critical & imperfect element in a telescope.

For the astrophotographer: It will show the user of a field corrector the performance of this optical element. Varying a few parameters will reveal the required precision for proper placement. It is also possible to verify the validity of the amplifying device (namely Barlows) used to enlarge planetary images.