Visionstar OL-920

Nd:YAG Source at 1064nm

The laser type is Nd:YAG with a wavelength of 1064 nm plus or minus 5 nm, the established infrared line for intraocular work of this kind.

Q Switched Multi-Mode

The mode is listed as Q switch, multi-mode, which is what concentrates the available energy into an extremely short pulse instead of a continuous output.

Single, Dual and Three Pulse Output

Pulse output can be single, dual or three pulse. Sequence duration is listed at 30 microseconds or less for dual and 50 microseconds or less for three pulse.

Nanosecond Pulse Width

Pulse width is 4.5ns plus or minus 10 per cent, with a repetition rate of 2.5Hz, so each application lasts only a few billionths of a second.

Seven Step Energy Regulation

Output energy is regulated from 100 per cent down to 6 per cent across seven steps, with maxima listed at 11mJ, 9mJ and 28mJ for one, two and three pulse.

Narrow Focal Spot

Spot size is listed at 30 microns with a cone angle of 18 degrees, concentrating the energy at the focus and dispersing it rapidly on either side.

Dual Spot Aiming Beam

The aiming beam runs between 630 and 680nm at under 0.4mW, presented as a dual spot so the target can be positioned before any treatment energy is applied.

Coaxial and Confocal Alignment

The manufacturer states the treatment and aiming beams are coaxial and confocal with the microscope focal plane and the slit lamp, with a built in protective system alongside.

Intraocular Work Without an Incision

The defining property of a Q switched YAG system is that it acts at a focus inside the eye without opening it. The manufacturer describes ophthalmic micro-surgery implemented without cutting the eyeball, which changes what can be done in a clinic room instead of a theatre. Which procedures and which patients are appropriate is entirely a clinical judgement for the treating ophthalmologist, and no product page should be read as guidance on that.

Precise Targeting Through the Slit Lamp

A dual spot aiming beam at 630 to 680nm under 0.4mW lets the operator establish the target before firing, and the manufacturer states the treatment and aiming beams are coaxial and confocal with both the microscope focal plane and the slit lamp. That alignment is the whole basis of accuracy here, since the effect occurs at the focus and nowhere else, and a beam focused a fraction out of plane acts in the wrong place.

Graduated Energy Selection

Regulation from 100 per cent down to 6 per cent across seven steps, combined with the choice of single, dual or three pulse output, gives the operator a structured range instead of a continuous dial. Discrete steps have a practical advantage in a clinical setting, since a step is repeatable and describable, and a clinician can build a reliable sense of what each one does over time.

Confined Effect at the Focus

An 18 degree cone angle and a 30 micron spot mean energy is concentrated at the focus and disperses quickly beyond it. The material states power density reaching the fundus falls below one ten thousandth of that at the focal point, with an action time of only a few nanoseconds. That geometry is the reason the technique is confined to its target, and it is the manufacturer's own account rather than an independent assessment.

Effect Confined to the Focal Point

Everything about this system follows from concentrating energy into 30 microns and letting it fall away sharply outside that volume. A tight cone angle, a nanosecond pulse and a focus confocal with the observing microscope together mean the operator acts where they are looking. For work inside an eye, where the structures a clinician wants to leave alone sit millimetres from the ones they are addressing, that confinement is not a feature of the system so much as its entire purpose.

Repeatable, Structured Energy Control

Seven regulation steps from 100 per cent to 6 per cent, together with single, dual and three pulse selection, give a clinician settings that can be recorded, repeated and discussed. Continuous dials are harder to reproduce between sessions and between operators. In a service where more than one clinician uses the same equipment, discrete and describable settings support consistency in a way a sliding control does not.

Alignment Built Into the Optics

Coaxial and confocal treatment and aiming beams, confocal in turn with the slit lamp and the microscope focal plane, mean accuracy does not depend on the operator compensating for an offset. The dual spot aiming arrangement makes the focus visible before firing rather than inferred. Microprocessor control with a digital display then shows what has been selected instead of leaving it to be estimated from a scale.

The Visionstar OL-920 is a Q switched Nd:YAG system built around precision at a point. It operates at 1064 nm plus or minus 5 nm with a pulse width of 4.5ns plus or minus 10 per cent and a repetition rate of 2.5Hz, offering single, dual and three pulse output with maxima of 11mJ, 9mJ and 28mJ and regulation from 100 per cent to 6 per cent across seven steps. A 30 micron spot at an 18 degree cone angle concentrates the energy, and a dual spot aiming beam at 630 to 680nm under 0.4mW, coaxial and confocal with the microscope, establishes the target first.

This page states what the technical data states. Electrical supply, dimensions, mass, protective eyewear, interlocks, service requirements, configuration and condition do not appear on the material held. The safety characterisations regarding dispersal beyond the focal point are the manufacturer's own account and not an independent assessment. Nothing here should be read as a claim about testing or regulatory approval, and a system of this kind is intended for appropriately trained clinicians in a controlled laser environment.

If your service is considering this capability and wants the specification checked against the slit lamps and rooms you already have, speak to Medigear.uk. As a verified medical equipment supplier working across medical, dental, rehabilitation and aquatic therapy settings, the team will confirm what this system offers and what installing it would involve.