We try to improve the accuracy of eccentric photorefraction by taking more information into account than just the size and tilt of the crescent. Based on Gaussian optics and the assumption of an isotropic scattering retina, a theoretical analysis of the light-intensity distribution in the pupils of astigmatic eyes is presented. The method is applied to different photorefractor setups (point lig...

As I say in the paper, there is a second linearity or knife-edge or razor-edge critique. First popularized in a short review article by Jones (1999), and further elaborated in Jones (2005), it consists of the claim that to sterilize the (strong) scale effect the models proposed by DinopoulosThompson (1998), Peretto (1998), Young (1998), and Howitt (1999), assume that the mass of products/firms,...

PURPOSE To evaluate the lens edge interaction with the ocular surface with different edge designs using optical coherence tomography and to examine the effect of lens power on the lens edge interactions. METHODS Four types of silicone hydrogel lenses with different edge designs (round-, semi-round-, chisel-, and knife-edged) at six different powers (+5.0, +3.0, +1.0, -1.0, -3.0, and -5.0 diop...

We propose a path loss model with an over-roof propagation path between mobile terminals in residential areas. A double knife-edge diffraction model shows that over-roof propagation loss can be accurately estimated. Measurement results confirm the estimation accuracy of the new model.