| 摘要 |
The eyecup (1) forms a tight seal with the eye area of a user. Ventilation openings (10) are provided in the area above the ocular (3) and are spaced around the eyecup, to direct an air current onto the inner side of the ocular lens. The cup can be rotated with respect to the ocular. Additional ventilation may also be provided using a fan, or similar device. The eyecup is made of an elastic material, so that pressing on the outside produces a pump effect. |
