To find out Type of Astigmatism, We first need to know the classification. There are many but the important ones are based on focal points and Principle meridians.
Dynamic retinoscopy is also called Near Retinoscopy because it is done while patient is focusing on a near target(In accommodated state). The main purpose of Dynamic Retinoscopy is to find out the accommodative response of the patient(lag or lead or normal).There are different methods of performing Dynamic Retinoscopy.
Static Retinoscopy can be done in two ways; using a working distance (WD) lens in front of the patient’s eye or without it.
A working distance lens is used in order to compensate the distance between the examiner and the patient’s eye. Usually, the working distance is taken as arm length i.e 66cm (+1.50DS)