Modulation-transfer-function-based optical sensitivity and tolerancing programs

Two new computer programs are described. The first, ZEST, predicts the sensitivity of lens performance to perturbations of the constructional parameters of the lens. The second, ZEALOT, predicts the statistical distribution of the performance expected from a sample of actual manufactured lenses. Both programs are based on the wave front and the modulation transfer function and permit a more general approach to lens specification, tolerancing, and testing.