PRESBYOND is a type of laser blended vision that treats presbyopia by combining precise distance correction with a controlled difference between the two eyes. It aims to extend the depth of focus while maintaining good binocular vision.
Principles of PRESBYOND
One eye is optimised for distance and the other for intermediate and near, but the laser also increases depth of field by adjusting higher-order aberrations. This creates a smooth overlap between the eyes rather than a stark monovision split.
- Pre-operative contact lens trials may simulate blended vision
- Careful patient selection and counselling are key to satisfaction
- Some people adapt quickly; others need several weeks
- Enhancement procedures can refine the result if needed
Outcomes
Many patients achieve good functional vision at multiple distances with reduced need for reading glasses. Night driving, very fine print, or prolonged close work may still require additional correction for some.
- Not suitable for everyone, especially if there is significant eye disease
- Post-surgery follow-up assesses visual balance and comfort
- Reversibility is limited once corneal tissue has been removed
- Lens-based options may be preferred in older patients with early cataract
