DOCTER DOCTER®sight III - Manual (Page 18)

Battery warning
The mode LED (5) signals if the battery should be replaced in the next time. Then,
the display flashes in intervals of one second.
When there is switched on again, the battery voltage is checked again. If the battery
could recover or the light conditions have changed, it can happen that a repeated
warning is not indicated for the time being. Despite the battery warning, the sight
device still can be operated for a longer time period (reserve of about 20 %).
However, the brightness of the light dot increasingly reduces and an operating mode
setting higher than that made before can be necessary.
Maintenance and Care
To clean the optics, use glasses cleaning clothes. Before doing that, the optics
surfaces should be carefully cleaned using a soft and clean cloth or a hair brush
where no chemical solvents are to be applied.
Heavy dirt should be removed using distillated water. Otherwise, furrings can occur
on the surfaces.
In case of possibly function-affecting damages, the device has to be sent to an
authorized service workshop.
Hints
Due to their specific construction, DOCTER red-dot reflex sights do not have a
diopter compensation unit or other function units that compensate for the visual
defect of the human eye.
Thus, all individual visual defects of the respective shooter have a direct effect on the
contour of the perceived light dot.
Seeming ovality, sickle-shaped distortion, "star clusters" or a "frayed" contour of the
dot do not mean a defective device, but rather and exclusively mean a physiological
change of the eye (astigmatism).
Then, it is recommended to use corrective glasses or to have the eyes checked by an
ophthalmologist.