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Laser blended vision for age-related loss of reading vision (presbyopia)

PRESBYOND (Carl Zeiss Meditec) has transformed the approach to vision correction for people with age-related loss of reading vision, also known as presbyopia.

It is an evolution of traditional LASIK monovision, whereby LASIK is used to set one eye for distance vision and the other eye for near vision. This was a good strategy, but patients were often aware of blurred vision, or a "blur zone", in the important intermediate range of vision (e.g. car dashboard, dinner plate, desktop computer). 

PRESBYOND was developed by Zeiss to turn this "blur zone" into a "blend zone", and provide good functional vision through the  intermediate range. It does this with a sophisticated wavefront LASIK treatment that cleverly harnesses spherical aberration, a naturally occurring visual phenomenon which can either enhance or reduce visual quality. With just the right amount, both visual quality and depth of focus are optimised.

This video from Zeiss explains the concept more:

The most common surgical alternative to PRESBYOND is lens replacement with either multifocal lenses or monovision with monofocal lenses. However, as PRESBYOND is more accurate and less invasive, with lower surgical risk and fewer concerns regarding glare and haloes, it is now my preferred option for suitable patients with presbyopia, but who have not yet developed cataracts. A thorough assessment of your eyes will enable me to establish which option is best for you.

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