PURPOSE: To rapidly display the aberration property of a lens in a form easy to observe, by calculating not only the lateral aberration quantity on a surface containing an optical axis but also the lateral aberration quantity on a surface separated from the optical axis and further displaying both aberration quantities.
CONSTITUTION: Object point data, pupil surface light passing position data and lens constituting data are inputted to a processor 7 from a keyboard 1 or an external memory apparatus 8. The coordinates operation means 2 on a surface to be evaluated performs the light tracing operation of reference light and sample light to respectively calculate the coordinates of a reference point and the coordinates of the intersecting point of the ample light and the surface to be evaluated to output the same to a lateral aberration operation means 3. The means 3 operates the deviation of the reference light and the sample light from the coordinates data of both lights on the surface to be evaluated to output the same to a display control means 5 as lateral aberration quantity. A pupil coordinates system preparing means 4 prepares a pupil coordinates system to output the same to the means 5 which in turn calculates a coordinates point to be displayed from lateral aberration quantity and pupil surface coordinates system data. By repeating the above-mentioned processing the lateral aberration quantities of a large number of sample lights passing through a pupil surface can be observed at a glance.
MASUYAMA TAKESHI
MURAKAWA AKIRA
