Optical analysis of freeform spectacle lens based on eye model

Spectacle lenses performance is simulated based on the eye model system. The modulation transfer function (MTF) curve of spherical lens, aspheric lens and optimized lens is analyzed, and the results are compared and analyzed non-curved lenses were found to be more effective in improving image quality. For free-form lenses, we measured the far-field, progressive corridor and near-field in the simulated optical system, and studied the relationship between the face matching angle and the tilt of the endoscope and the MTF of the conventional spectacle lens and the free-form lens. The experimental results show that when the face fitting angle and the inclination of the endoscope inclination increase, the MTF decreases and the imaging quality deteriorates. The tilt of the endoscope has the greatest influence on the MTF value, followed by the face fitting angle, where the influence of the spatial frequency is negligible, but as the spatial frequency increases, the MTF also decreases. Therefore, for the free-form surface, when the face fitting angle and the inclination of the endoscope are different, the image quality is easily affected, so these two factors must be fully considered in the design.