Hi folks.
See this :
http://vision.about.com/od/contactlenses/f/Monovision.htm
I am nearsighted (far objects are not in focus) but I can read or see clearly from very close when I wear no glasses or contact lenses.
About 15 years ago, my optometrist offered me to try monovision.
My dominant eye being the rigth one is fully corrected for distance viewing while my left eye, is undercorrected by a few dioptries.
The net result is that, far objects are sharp when seen by my rigth eye and not sharp when seen by my left eye. In reverse, close objects are sharp when seen by my left eye and not sharp when seen by my right eye. The brain can compensate and objects appear sharp at all distances. Well .. after an adaptation period.
If I drive a car, for example, the rigth eye does the hard work. If I read, the left eye does the hard work.
Surprisingly, I went to see Avatar in 3D and had no problem with the 3D effects, they were present.
Also, with this scheme, the closer limit of my rigth eye and the farther limit of my left eye slightly overlap a little and this happens more or less at the normal viewing distance of a computer screen of about 24 inches or 60 centimeters.
My optometrist told me that if these limits don't overlap, there is a "hole" or a zone where none of the eyes is seing sharply and this may cause problems. In such cases monovision might not work.
Just ideas.
