---
title: Is PRESBYOND surgery suitable for unilateral (one eye) treatment?
description: "PRESBYOND is usually planned as a binocular blended‑vision treatment, but unilateral surgery may be considered in specific circumstances. ## When one-eye treatment may be appropriate Asymmetry or prior surgery can drive decisions. - One eye already optimally corrected by previous…"
url: "https://bluefinvision.com/knowledge-base/topics/suitability/is-presbyond-surgery-suitable-for-unilateral-one-eye-treatment/"
updated: "2025-12-30"
category: Suitability
---

# Is PRESBYOND surgery suitable for unilateral (one eye) treatment?

PRESBYOND is usually planned as a binocular blended‑vision treatment, but unilateral surgery may be considered in specific circumstances.

## When one-eye treatment may be appropriate

Asymmetry or prior surgery can drive decisions.

- One eye already optimally corrected by previous surgery or naturally
- Lazy eye or reduced potential in one eye limiting its usefulness for blended vision
- Trial of unilateral monovision contact lenses proves comfortable
- Patient prioritises minimal intervention with acceptance of some imbalance
- Surgeon judges that binocular function will remain adequate

## Potential drawbacks

Balance and depth perception may be affected.

- Greater risk of symptoms from anisometropia or rivalry between eyes
- Possible reduction in stereopsis and fine depth judgement
- More challenging neuroadaptation than with planned bilateral treatment
- Full discussion and often contact‑lens simulation are recommended first
- Many patients still achieve best performance with bilateral blended vision