This is an option for those people over 40 who require reading glasses for near vision tasks. Mono vision gives you good distance and near vision by treating one eye for distance and one eye for near vision or partial near vision. Many people learn to adapt to mono vision with excellent results. Your dominant eye is usually treated for distance vision and your non-dominant eye is slightly under corrected for near vision. Your eyes learn to work together after an adaptation period and many people need no glasses for distance or near with this option. Millions of people wear mono vision contact lenses with great success.