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PRESBYOND laser blended vision is one of the newest forms of laser eye treatment used to
treat presbyopia.
Presbyopia is a condition that tends to affect people in their late 40s to early 50s.
It is a condition that requires the patient to wear varifocal glasses or bifocal glasses
because they're having difficulty focusing at different distances, in particular seeing
things up close.
Why does this happen?
It happens because the lens which lives inside the eye behind the coloured part of the eye
is getting thicker and more stiff and the eye is having difficulty moving it in order
to zoom or focus the light correctly.
What can we do about that?
Well, we know vision happens in the brain.
It doesn't happen in the eye.
The eyes merely give the information to the brain in order to build up the picture
of the world around us.
In PRESBYOND laser eye surgery one of the eyes, the dominant eye, is focused for distance
and the other one is focused more for near and there is an overlap in the middle.
So the two eyes give information to the brain for distance, middle, and near allowing the
patient to see the range of distances without glasses.
Now this is slightly different to how the brain is used to working and therefore it
needs a bit of time to get the hang of it.
In some patients, they get the hang of it the next day.
Others take a little bit longer, it's called neural adaptation.
It's like getting used to a new pair of glasses and we always say wait three months before
you make up your mind.
Of course in some patients it isn't suitable and we are able to assess them preoperatively
in the clinic.
We can simulate the condition using lenses and if we find that they're not able to process
the two pictures in that manner then we do not advise them to go ahead with that kind
of laser treatment but in a lot of cases it is very suitable and the patients are extremely
happy to be able to see all the different distances without glasses and we've had a
well proven track record.