Barrier filter wavelength for Optos California

Mon, 10 Feb 2025 18:49:01 GMT

Good afternoon all,

What is the wavelength of the barrier filter for FAF for the Optos California?

Mon, 10 Feb 2025 19:24:51 GMT

I don't know if they use a barrier in some of the digital systems, because the sensor can be designed to only look for specific wavelengths. We have an RG California and an RGB California, but I suspect the AF is the same on both, just the RGB includes IRAF.

That being said, I'm 100% open to being wrong. This is what I've found:

"optomap color rgb images are composite images of three laser wavelengths: red (635nm), green (532nm) and blue (488nm). Images are captured producing both optomap color rgb and a standard optomap color rg image. The clinical utility of optomap color rg is supported by more than 3,000 peer-reviewed publications across a variety of diseases."

https://www.optos.com/globalassets/public/optos/providers/clinical-papers/css-color-rgb-us.pdf

Mon, 10 Feb 2025 19:28:44 GMT

This might be a better resource:

https://www.e-retina.or.kr/journal/view.html?doi=10.21561/jor.2016.1.1.1

"Ultra-widefield FA is available in the Optos system since the P200A model provides a high-resolution wide-angle angiographic module. Single capture using a 488-nm laser with a 500-nm barrier filter enables angiographic view of peripheral vascular structure, including perfusion status, leakage, and staining, which can be missed on the seven-standard fields of the Early Treatment Diabetic Retinopathy Study [17-20]. ICGA was recently added to the multimodal capabilities of the Optos. ICGA is performed using an 805 nm excitation beam and an 835 nm barrier filter."