1. Auxiliary device for attachment to an injection device comprising a dose of a window, which closes the sleeve, on which are marked dose values, wherein the auxiliary device comprises: a main body, support means for the auxiliary device main body at a predetermined position relative to the injection device, a transparent protective window located on the surface of the main body, which is aligned with a window-dose injection pen during use, the sensor device is installed in the main body and comprising a sensor directed at the protective window, a lighting fixture comprising one or more light sources, wherein each of one or more light sources is directed to the protection window inepropuskayuschuyu part, wherein, impervious portion is disposed on the optical path between the first of the one or more light sources and a point on the dose window, which will be reflected to the sensor, and either provided on the surface of the protective window or provided within the material forming the protective window. 2. Auxiliary device according to Claim. 1 wherein the protective window has optical silu.3. Auxiliary device according to Claim. 1 wherein zaschitnoeokno sealed to the main body to prevent ingress of material into an auxiliary shielding device around okna.4. Auxiliary device according to Claim. 1, which portion is provided on an impermeable surface of the protective window that is closest to the touch prisposobleniyu.5. Auxiliary device according to claim. 4, wherein the impervious part contains a light-blocking pyatno.6. AT1. Вспомогательное устройство для прикрепления к инъекционному устройству, содержащему окно дозы, закрывающее гильзу, на которой маркированы значения дозы, при этом вспомогательное устройство содержит:основной корпусприспособление для поддержки основного корпуса вспомогательного устройства в предварительно заданном положении относительно инъекционного устройствапрозрачное защитное окно, расположенное на поверхности основного корпуса, которое совм
