A monovision effect.
There are some disadvantages to monovision.
Monovision lenses are an alternative to multifocal contacts.
Monovision is currently the only way to choose a color contact lens.
Others claim that monovision does not give them the vision correction they need.
Another downside is that getting fitted for monovision lenses is more complicated and may require more follow-up appointments since they are harder to get used to than multifocal lenses.