Why is My Vision Still Low After PresbyLASIK?

Why is My Vision Still Low After PresbyLASIK?


The fundamental principle of PresbyLASIK involves creating a monovision setup. In this approach, one eye is corrected for clear distance vision — typically achieving 1.0 to 1.2 — while the other eye is intentionally left slightly nearsighted, making it easier to see things up close.


This intentional difference between the eyes (monovision) is carefully designed to minimize dizziness or discomfort. During the early weeks after surgery, some people may feel slightly uncomfortable or unbalanced, but most patients adapt within 2–3 months, and discomfort generally becomes negligible.


Why is Monovision Used in Presbyopia Surgery?

The reason monovision is used during presbyopia correction surgery lies in a concept called “depth of focus.” This is similar to the background blur effect seen in photography, where the subject is in sharp focus while the background is soft and out of focus.


In cameras, depth of focus is extended by narrowing the aperture so that both near and far subjects remain in focus. Similarly, PresbyLASIK reshapes the cornea into an aspheric profile to extend the eye’s natural depth of focus.



Once the depth of focus is extended, a slight monovision is introduced — one eye is optimized for distance, and the other for near vision. If this were done without first extending the depth of focus, the brain might perceive it as if one eye were “shut off.” However, because the depth of focus is already broadened, both eyes continue to function together across various distances.


This specialized surgical technique is known as LBV (Laser Blended Vision) PresbyLASIK.



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