Sciascopic and prismatic ruler
Интернет-магазин оптики / Catalogue / Eng / Ophthalmologist's office / Sciascopic and prismatic ruler
The skiascopic ruler is used for the study. This measuring device consists of two linear frames, in one of which positive lenses are placed successively increasing in optical power, and in the second — negative (range from 1 to 9 D). There is also an additional attachment with 0.5 and 10D lenses (used to reduce the pitch and / or expand the available range).