As part of the normal aging process, all of us over the age of 40 lose the ability to focus on near or intermediate objects, a condition termed presbyopia. Monovision and Blended Vision are alternatives to reading glasses or bifocals for people with this problem.
With Monovision or Blended Vision, one eye is corrected for distance and one eye for near or intermediate. This concept is nothing new and dates as far back as 1720, when the monocle was invented. In more modern times, using different eyes for different tasks has been done successfully for several decades using contact lenses, AND virtually all surgical methods for correcting vision, including LASIK, PRK, CK and cataract surgery.
Monovision vs. Blended Vision
In either method, the dominant eye is corrected for distance vision. With Monovision, the non-dominant eye is corrected for close objects, i.e. books or prescription bottles.
In Blended vision, the non-dominant eye is focused for intermediate distances, like computers or dashboards. Since it’s more of a “blend” between reading vision and full distance correction, a patient may still need glasses occasionally for very small print, but the advantage of Blended Vision is the difference between the two eyes is less significant and can make adaptation easier.
As different as it might sound, Monovision and Blended Vision are oftentimes highly successful. In each instance, both eyes are used together 100% of the time; however, the brain automatically favors one eye or the other. A very small percentage of patients do not adjust well to either Monovision or Blended Vision. A contact lens or glasses trial can help determine if either is right for you.