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- Newsletter December 2023

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Solea
RGB LED Light Source

Seeing the full spectrum

Facts at a glance
essential requirements

Intraocular illumination of the surgical field plays a fundamental role in vitreoretinal surgery. It has an influence on the success and efficiency of a surgery.

The spectrum of innovative RGB technology

Light sources must meet three main characteristics

generate a color rendering that enables correct conclusions about the anatomy

provide the necessary brightness

provide a high level of safety for users and patients before, during and after use

The spectrum of innovative RGB technology

By displaying 16.7 million colors, the RGB LED technology provides new insights into the posterior segment and thus new applications Local contrast enhancement improves the visualization of specific structures in the eye (eg vitreous body, ERM, ILM, etc.) The Solea opens up new possibilities for making vitreoretinal surgery even safer, in particular through the use of a red LEDDue to the narrow-band emission of light from the RGB LEDs it makes the use of additional UV or IR filters unnecessary The user-friendly control panel and intuitive user interface increase the safety and efficiency in the OR

Contrast enhancement through targeted color rendering can visualize the vitreous in central or peripheral vitrectomies up to the vitreous base — here a turquoise-blue hue — can increase visibility. Bluish colors are particularly suitable for ablation and removal of vitreous remnants.

Orange-brown shades can be useful for specific contrast enhancements, for example, during the localization of retinal detachments.

Thanks to the additive color mixing in the RGB color space, the surgeon can use eg green hues, to better visualize deeper structures as the choroid.

Minimizing phototoxicity

Despite numerous innovations, some problems in endoillumination of the eye have not yet been solved in recent years.Harmful UV and IR rays arriving from outside are largely filtered by the cornea and lens of the eye, but this natural protective barrier is bypassed during endoillumination.

The greatest danger is the destruction of cells in the retinal pigment epithelium (RPE) due to blue light damage, also called phototoxicity. The irradiation causes so-called oxidative stress on the photoreceptors in the RPE1 , in which oxygen radicals (ROS) can form due to the photochemical processes and thus an increased deposition of eg lipofuscin is induced. This problem ultimately leads to increased cell death and thus promotes the development of other pathologies such as macular degeneration (AMD)

Studies show that high-energy, visible wavelengths of 415 – 455 nm have the highest potential for oxidative stress on the RPE2,3 . These wavelengths are increasingly produced by cool white LEDs, which means that a phototoxic light component that cannot be neglected is present.

(Image: Blue light has the highest phototoxic potential)

Other factors influencing the degree of phototoxicity include intensity and exposure duration of the irradiation as well as the size and type of the endoilluminator, but also the distance to the retina.

In addition to the selection of the endoilluminator, eg wide angle fiber optic, which scatters the light more broadly and thus has lower irradiation intensities on the retina, primarily the selection of the right light source plays a role in reducing the exposure to phototoxic radiation.

In order to further minimize the risk, appropriate standards such as ISO 15004-2 have been created. These determine, among other things, the safety of the application through limiting values for the maximum irradiation in the eye. Nevertheless, in spite of all the measures taken so far, damage cannot be completely eliminated.

(Image: Different types of fiber optics and working distances)

Trend-setting retinal protection

To further reduce the risk of phototoxicity, the new Geuder Solea light source features an innovative retina protection mode. This new function deactivates the blue LED and thus minimizes the phototoxic component almost completely. The remaining light when the blue LED is deactivated is composed of a red and green LED, which due to their wavelengths in the relevant range between 500 and 635 nm have a lower phototoxicity than cool white LEDs. In addition, the safe irradiation time is increased at least 30 minutes (according to ISO 15004-2).

Spectrum in normal mode

Spectrum in retina protection mode

Lifespan LED

The short durability of the xenon light sources is extended by up to 100 times thanks to the longevity properties of the LEDs. Whereas conventional xenon light sources require a lamp replacement after approx. 300 – 500 h, LEDs allow durability of up to 60,000 h and thus reduce the service effort and follow-up costs. LEDs also have a constant light output, whereas xenon lamps have power losses (approx. 50% after 200 h).

Solea
RGB LED Light Source

Facts at a glance
essential requirements

The spectrum of innovative RGB technology

Light sources must meet three main characteristics

The spectrum of innovative RGB technology

New insights through RGB LED

Minimizing phototoxicity

Trend-setting retinal protection

By switching off the blue LED, the relative spectral irradiation of the SOLEA® changes

Lifespan LED

More details and accessories

Catalog Systems and Accessories

Solea RGB LED Light Source

Facts at a glance essential requirements

Innovation

Protection

Easy to use

Innovation

Protection

Easy to use

The spectrum of innovative RGB technology

Light sources must meet three main characteristics

The spectrum of innovative RGB technology

New insights through RGB LED

Minimizing phototoxicity

Trend-setting retinal protection

By switching off the blue LED, the relative spectral irradiation of the SOLEA® changes

Lifespan LED

More details and accessories

Catalog Systems and Accessories

Solea
RGB LED Light Source

Facts at a glance
essential requirements