An apparatus for the treatment of glaucoma with a laser catheter and a light-conducting fiber arrangement, to the proximal end of which light can be coupled and at the distal end of which a light-emerging surface is provided, with a pressure-sensitive device to achieve a specified contracting pressure of the light-emerging surface. Each lamp-operating device in said control system is part of a first or a second type while lamp-operating devices of the first and the second type can be combined into functional couples. A switching arrangement is associated with the plurality of signal input paths. The incoming signal is also sampled a predetermined number of times at intervals less than the minimum pulse interval to record a set of maximum signal values. in an offline session, such instructions cause the imported and embedded functional logic to execute, thereby manipulating the data that is imported at the client.