How does PRESBYOND work?
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A surgeon uses an excimer laser to reshape the cornea in each eye to a different target: the dominant eye is usually aimed at distance, and the non-dominant eye is left slightly short-sighted to help with near vision. A non-linear ablation profile is used to blend the two images.
Quick answer
A surgeon uses an excimer laser to reshape the cornea in each eye to a different target: the dominant eye is usually aimed at distance, and the non-dominant eye is left slightly short-sighted to help with near vision. A non-linear ablation profile is used to blend the two images.
A general answer about SMILE Pro, not advice about your own eyes. Only an ophthalmologist who has examined you can answer it for your case.
- Topic
- PRESBYOND and presbyopia
- Answer length
- Quick answer plus detail
- Sourced
- Yes
In more detail
The difference between the eyes is planned from your refraction, dominance and the measurements taken at assessment. The brain does the rest of the work, which is why adaptation is part of the treatment rather than a side effect of it.
The amount of difference is a clinical decision, not a fixed number, and it is one of the things worth asking about specifically at a consultation.
Related guides
Subjects this question touches
The pages that answer the subject behind the question, rather than the question itself.
- Procedure SMILE Pro
- Comparison SMILE Pro vs LASIK
- Place SMILE in Dubai
- Procedure SMILE
- Comparison LASIK vs SMILE
It describes what is generally true. Whether it applies to your eyes depends on measurements taken during an examination, and two people asking the same question can receive different answers. Read the answer as a starting point for the conversation, not as its conclusion.
People also ask
The closest subjects to this question, from both question banks.
- What is PRESBYOND Laser Blended Vision? PRESBYOND and presbyopia
- Is there an age limit for PRESBYOND? PRESBYOND and presbyopia
- Is PRESBYOND suitable if I have cataracts? PRESBYOND and presbyopia
- Can PRESBYOND affect depth perception? PRESBYOND and presbyopia
- Why might two surgeons recommend different options? PRESBYOND and presbyopia
- Why do lights look different at night after PRESBYOND? PRESBYOND and presbyopia
More SMILE Pro questions
Sources & further reading
We prefer primary sources. Where a claim comes from a manufacturer, a single study or a regulator, it is labelled as such below.
- Assessing the Visual and Refractive Outcomes of PRESBYOND Laser Blended Vision Treatment in Myopic and Hyperopic Presbyopic Patients in Western Australia
A retrospective, non-comparative series of 125 consecutive patients (250 eyes) treated with PRESBYOND using a MEL 90 excimer laser and VISUMAX 800 femtosecond laser, followed for six months. Two authors disclose relationships with the manufacturer.
Used for What a six-month series reported for distance and near vision; The retreatment rates it reported, separately for myopic and hyperopic patients; The study design, size, follow-up and declared conflicts that limit how far it generalises.
Link checked 21 October 2026
- ZEISS PRESBYOND: excimer laser technology
The manufacturer’s professional page for the PRESBYOND software and its ablation profile, written for clinics rather than patients.
Used for Which platform and software a clinic needs to offer PRESBYOND; The manufacturer’s description of the non-linear aspheric ablation profile.
Link checked 21 October 2026