Monovision
One option for giving you a good range of clear vision without using a multifocal or accommodating premium lens is monovision. In monovision, one eye is set for a distance correction and the other eye is set for a near correction. This is commonly done in patients who wear contact lenses and are starting to develop presbyopia. A benefit of monovision is that excellent, clear vision can be obtained at many distances; and there is no additional charge for the procedure because a standard monofocal lens is used. There are several disadvantages to monovision. Before selecting monovision as an option you should undergo a contact lens trial to see if your brain will tolerate monovision. When there is a difference in focus between the two eyes, as occurs in monovision, there can be a feeling of visual discomfort because your brain is trying to put together two dissimilar pictures. Many people cannot tolerate monovision because of this reason. To have excellent depth perception the brain requires two images focused at the same distance, therefore, patients with monovision note a decrease in their depth perception. Monovision can be a well-tolerated and useful option for patients seeking to avoid the use of glasses after a cataract surgery, but must be carefully assessed before the surgery is done because, unlike with contact lenses, after a cataract surgery the implanted lens cannot be changed.
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