A pixel calculating device for performing vertical filtering that includes 16 pixel processing units 1 to 16 and an input buffer group 22 storing 16 pieces of pixel data and filter coefficients. Registered doctors from which prescriptions are received via the communications network have their identities authenticated. A swivel assembly is connected to the neck portion. R7 is hydrogen or alkyl having from 1 to 3 carbon atoms. The parasitic elements can be optionally grounded or floated in order to reflect the wireless link towards the driven element. The control module is disposed in the case.