As we age, the eye's natural lens becomes unable to flex, hence the need for reading glasses in middle age. This condition is known as Presbyopia, and start showing up in patients over 40's. That means the muscles that move our natural lens, doesn't work in the same manner as before. Eventually the lens becomes clouded, known as a cataract, and requires surgery to remove it.
Monovision surgery is a procedure were the doctor treat one eye, in order to see distance and the other for near. This procedure is performed very often on patients over 40's that are experiencing presbyopia and are looking for independency of glasses or contacts.
Monovision works in manner that with one eye you can see distance and the other to see near, that means if your want to see something at distance, your brain will do the arrangements to determine with which eye you can see better the object that you want to see, and then, the brain will give as a dominant eye the one that you see better, and it work the same way if you want to read, because your brain will detect spontaneously the eye which you can read, and will give as a dominant eye the one that you can read.
Some people believe that with monovision, patients will eventually see half of the image fuzzy and the other half clear. This concept it will be not very rare at all, consider that there is a lower rate of not candidate for this surgery. Obviously Monovision surgery is not recommendable for everyone due to the fact that monovision refocuses both eyes. While it can be a huge improvement for many, it can be a disadvantage for people that are active and like to read for long periods of time but also has some consequences if you proceed. The patient who wants to experience monovision will eventually have some peripheral vision lost. So in order to know if you are a good candidate, most doctors simulate the monovision with contact lens before the procedure.
Page updated August 25, 2010