The Eyehelper is easily fitted to the spectacle lens with an elastic band that is casted into a molded cap, you simply adjust it sideways. The directional arrow should be towards the nose.
In addition it is important that the glasses fit properly and are placed correctly on the nose. Frequent adjustment of the glasses by an optician is recommended. Glasses with bows are also recommended.
The Eyehelper is also easy to use with glasses without visual power.