Presbyond Laser Blended Vision
Presbyopia is the term given to the loss of the eyes ability to alter its focus from distant to near objects. It is an age related condition which affects everyone at about the age of 45.
Presbyopia can come as a shock especially to people who never needed glasses in their younger years. It also can be very frustrating to people that used glasses for distance and now they have to use different glasses for intermediate and near vision. It is important that when thinking of presbyopia patients consider at least three separate focal distances
- Distance vision
- Intermediate vision
- Near vision
For many years, ophthalmologists have provided for contact lens wearers a technique called monovision. Monovision means that one eye (the dominant eye) is corrected fully for distance and the other eye will be slightly under corrected to compensate for reading. This can work very well for middle aged patients who still have a little flexibility in their eyes focusing system. With increasing age, a patient depth of focus or accommodation will decrease and the reading strength will need to be increased accordingly. This ultimately creates a blur zone for intermediate distances such as when looking at the dashboard of a car, or prices in a shop window. So the situation is that we have 2 eyes and we need to consider three focusing distances. So as we grow older, monovision becomes less tolerable because of the difference in correction of the two eyes. And this is what causes the blur zone.