In MO Prism lenses, the vision-shifting prism segments are produced with powers for near vision, and a lens type most appropriate for the user’s requirements is selected for the surrounding carrier lenses. This ensures that the combination functions even in more challenging working conditions. MO Prism lenses are always manufactured with high-quality coatings to prevent scratching and reflections.
Single-vision and bifocal prism lenses
In a single-vision prism lens, both the segment and the carrier lens parts have the same corrective powers. This kind of lens works perfectly when there is no need for near vision addition or only a small addition would be required. With stronger near vision additions, the corrective power of the carrier lens is usually made for a viewing distance that enables clear vision to mid-range objects, such as instruments or computer screen. An MO Prism lens with different powers in the segment part and the carrier lens part is called bifocal.
Trifocal prism lenses
Trifocal prism lenses are especially useful when strong near vision addition is required, but you also need to be able to see well at longer distances. The corrective power in the prism segment is for the working distance, and you can freely choose the viewing distances for the upper areas. Compared to progressive lenses, trifocal lenses have the benefit of wide and clear field of vision.
Progressive prism lenses
As in all MO Prism lenses, the segment part is made with powers for working distance. In a progressive carrier lens, the corrective power of the mid part of the lens is made for viewing mid-range objects, and the power diminishes gradually towards the top part that is used for looking further away. Progressive lenses most suitable for room distances include the so-called enhanced reading glasses and occupational progressive lenses. In these kind of carrier lenses, the narrow field of vision typical to progressive lenses can be widened by not including the area for far distance vision in the very top part of the lens. In addition, this also results in a more gradual change in the corrective power of the lens, which makes it easier to view various objects.