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Presbyond Blended Vision is an advanced laser treatment for treating patients with symptoms related to presbyopia.

What is Presbyopia ?

Presbyopia is the gradual loss of your ability to focus on nearby objects that starts around age 40, the time when most of us start to struggle to read fine print and find ourselves holding objects including our mobile phone further and further away to read the text. Using reading glasses helps to overcome this problem.

What is Presbyond Blended Vision?

Presbyond Blended Vision is a sophisticated laser technique to treat patients with presbyopia. It aims to give you independence from reading glasses, allowing you to read, use the computer and your smart phone without glasses.

The technique is an advancement of monovision (one eye is set for distance vision and the other non-dominant eye is set for near vision). It combines the simplicity and accuracy of corneal refractive surgery with the benefits of increased depth of field, retaining visual quality and resulting in a more continuous range of focus. As a surgical solution based on the naturally occurring spherical aberrations of the eye, blended vision extends the scope of customised ablation beyond the limits of conventional monovision laser methods in several ways.


Presbyond is suitable for anyone with Presbyopia. This includes a range of preoperative prescriptions, whether you are myopic (short sighted), hyperopic (long sighted) or have astigmatism, or a combination. If you have never worn glasses before but are finding that you now need reading glasses for close up activities you may only need one eye treated.

How is it corrected?

Similar to conventional monovision, the dominant eye is corrected for distance vision, whereas the non-dominant eye is corrected to be slightly myopic for near vision. The dominant eye then sees clearly in the distance and the non-dominant eye sees near. This micro-monovision strategy is further enhanced by a decisive difference: an increase in the depth of field of each eye using a wavefront-optimized ablation profile to create a continuous refractive power gradient for the whole optical zone of the cornea. Blended vision is an individualized treatment plan based on preoperative spherical aberrations and the functional age of the eye. As a result, a customized fusion of the two images for near and distance vision is created for each patient – the so-called “Blend Zone”.

Presbyond Presbyond

How does Presbyond Blended Vision work?

The laser reshapes the surface of the cornea just as it is done in conventional laser eye surgery. During conventional laser eye surgery the laser reshapes the cornea so that the power is the same throughout the whole cornea. During Presbyond, the laser creates different power zones so that parts of the cornea are corrected for distance vision and the other parts for reading vision.

A sophisticated treatment profile creates a positive spherical aberration in the centre of the eye thereby increasing depth of focus. This correction makes the image disparity from the two eyes smaller and the brain blends the images together even better, allowing you to practically manage most routine distance and near activities without glasses. Both eyes are usually treated to ensure the best possible balance of vision.

Presbyond Steps


Laser Blended Vision is performed as day surgery with the laser treatment taking less than a minute. It uses the same equipment as LASIK – a microkeratome or a femtosecond laser to create a corneal flap and an excimer laser to reshape the cornea to correct vision.


Recovery time is short with only mild discomfort and slightly blurred vision for up to 4 hours after the procedure. The time taken to adjust and fully feel natural with blended vision is different from person to person and can vary from a few weeks to several months. On the average, patients find they are able to return to their daily lives, glasses-free, the day after the procedure. Within weeks, practically they enjoy excellent vision for distance, intermediate and near tasks, binocularly. Occasionally, for driving especially at night or reading very fine print, they may need a thin pair of glasses

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  • Samyak Drishti was established in South Mumbai in 2005 by Dr. Sujal Shah, the first surgeon in India to perform Wavefront Optimized LASIK, Presbyond LASIK and SMILE.
  • 101, 1st Floor, Sukh Sagar, N S Patkar Marg, Girgaon Chowpatty, Mumbai- 400007

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