Dome magnifier

A dome magnifier is a dome-shaped magnifying device made of glass or acrylic plastic, used to enlarge words on a page or computer screen.

They are plano-convex lenses: the flat (planar) surface is placed on the object to be magnified, and the convex (dome) surface provides the enlargement.

[1][2] Dome magnifiers are often used by the visually impaired.

They are good for reading maps or basic text and their inherent 180° design naturally amplifies illumination from ambient side-light.

They are suitable for people with tremors or impaired motor skills, because they are held in contact with the page during use.