PRESBYOND® Laser Blended Vision is the ZEISS 'unique advanced method for treatment of patients, who have lost their accurate eye sight due to age.
It offers the possibility of finding freedom from glasses through a laser treatment, with the benefits of increased depth of field and, in more mature patients, with a small proportion of monovision.
What is the depth of field?
It is everything that is simultaneously focused.
If the eye functions like a camera, the vision is similar to a photograph.
When you take a photograph, focusing on a subject in the foreground, the background will be blurred.
Conversely, focusing on the background, the foreground subject will be blurred (if we use a large aperture), because the depth of field will be reduced.
To ensure every element of photography is working well, and to increase the depth of field, you have to close the iris.
The PRESBYOND® increases the depth of field in both eyes.
What is monovision?
The condition in which one eye can clearly see from a distance and the other sees well close.
It could be a natural condition from birth or acquired through glasses, contact lenses or laser surgery.
PRESBYOND corrects the distance the dominant eye and near the non-dominant eye, because it is born in a better condition at the sensory level.
That way you do not need to wear glasses for distance or closer vision.
Unfortunately completely missing the intermediate vision and binocularity that lets you see objects in three dimensions.
PRESBYOND® creates a small share of monovision in more mature patients (97%)with an increased depth of field to maintain the intermediate and binocular vision.
More correct from a distance
More correct up close
Reinstein DZ et al. Hyperopic LASIK for Astigmatism and Presbyopia Using Micromonovision With the Carl Zeiss Meditec MEL80. JRS. 2009; 25 (1): 87-93
Tolerated by 97% of patients
Vision with both eyes together
The brain fuses the image from a distance and up close without glasses
- V ision CHIARA -far, intermediate and near no-compromise up to 50 years and with a small proportion of mono-vision after this age
- OPTICAL QUALITY MAINTAINED
- Binocularity - stereopsis (visibilityof objects in 3 dimensions)
- WELL TOLERATED - 97%of patients
- ADAPTATION OF SHORT TIME
- OPPORTUNITY 'TO CORRECT DEFECTS ASSOCIATED WITH VIEW
(myopia, astigmatism, hyperopia,).
- CUSTOMIZED - on the basis of age and the individual patient's eye data
- IMMEDIATE EFFECT - many are able to read the day of the treatment
We can correct presbyopia, both when it manifests itself, and when it is associated with any other visual defects such as myopia and astigmatism or astigmatism ipermetopia.
PRESBYOND Laser Blended Vision is the first choice for treatment of presbyopic patients.
Many factors such as age, fusional and accommodative amplitude, tolerance to small differences between the two eyes (anisometropia), ocular dominance and refractive defect are considered,
The PRESBYOND® software combines these factors to generate a custom profile of the laser treatment in order to modulate the spherical aberration, increasing the depth of field of the whole visual system, together with the correction of the associated views defect (myopia , astigmatism, hyperopia), when present.
All this takes place without compromising the contrast sensitivity, stereopsis, or night vision, unlike other methods that exploit multifocality.
HOW IT CORRECTS?
Until it is a presbyopia of +1.50 diopters (45/50 years of age) both eyes see well at a distance, intermediate distance and up close without glasses. Over this age a little compromise will be required.
The dominant eye will see well at a distance and intermediate distance without glasses, while the non-dominant eye will see perfectly at intermediate distance and up close without glasses.
The brain is programmed to withstand a small difference between the eyes and is perfectly able to fuse the two different images that come from each eye.
The result is that binocular vision is maintained.
It is immediately reversible with the help oflight goggles.
Alternatively a very slight reprocessing in one eye can forgive the non-dominant eye in the same situation of dominance, with the advantage of maintaining an increased depth of field.
To conclude, PRESBYOND® corrects presbyopia solving all the objectives of binocular vision at all distances, without compromising safety, contrast sensitivity and night vision. It also simultaneously corrects other defects such asastigmatism.
The key to this solution resides in modulating the physiological mechanism of the spherical aberration associated with the natural binocular fusion.
We do not use a multifocal approach that would involve two images simultaneously with two different fires in the same eye, as the brain then has a harder time selecting between them.