抄録
The primary illumination for the oral cavity is only the operating light in the unit. However, using this illumination alone, its optical axis differs from the visual axis of the operator, causing shadows.
We used glasses with a light and lens (Orascopic) and obtained good results. This light is fixed in the mid-area of the glasses, i. e., above the nose. Therefore, the optical axis of this light is in accord with the visual axis of the operator, causing no shadows.
