Light is one of the most important, yet misunderstood, drivers of your health.

To explore these intricacies, we sat down with Dr. Alexander Wunsch, MD, PhD—a leading authority in photobiology and light medicine. A German physician, researcher, and author, Dr. Wunsch has spent decades investigating how light interacts with human biology and serves as the Chief Science Officer at Ra Optics. Our conversation took place in honor of the International Day of Light, diving into the complexities of photobiomodulation, skin phototypes, vitamin D levels, and the often misunderstood relationship between sun exposure and health.

Starting today, eligible U.S. customers can now purchase Ra Optics using their Health Savings Account (HSA) or Flexible Spending Account (FSA)—making our scientifically engineered eyewear even more accessible.

This means you can now protect your eyes, sleep, hormones, and energy with pre-tax dollars—a savings of 30–40%, depending on your tax bracket.

BlueSync is the result of a multi-year collaboration with Dr. Alexander Wunsch, one of the world’s foremost authorities in photobiology. During extensive discussions about the future of light-based technologies, Dr. Wunsch proposed a concept he had been quietly cultivating: a lens that does not merely block blue light indiscriminately, but rather selectively filters the spectrum in a manner that supports the human circadian system. This idea matured into what is now BlueSync, a revolutionary lens that represents a new category of eyewear: circadian-strengthening eyewear.

Sunlight: Between Cure and Caution by Dr. Alexander Wunsch, M.D., Ph.D.

Many biohackers treat sunlight as a cure-all. But like any medicine, it’s the dose, timing, and context that make the difference.

Introducing BlueSync, a novel protective eyewear technology designed to filter harmful short-wave radiation (UV and HEVL) from the sun, while preserving the beneficial elements. 

Developed in collaboration with the world’s leading expert in photobiology, BlueSync is the first lens scientifically designed to strengthen the circadian rhythm during the day.

Today is a special day in the Northern Hemisphere: The Winter Solstice. This annual milestone brings with it a unique blend of astronomical wonder and cultural significance. The Winter Solstice also brings significant changes to biological life on Earth. For example:

• Animals adapt by migrating, hibernating, or altering their behavior and physiology. Think of a bear hibernating in a cave.
• Plants enter a period of dormancy, responding to the light and temperature changes. Many plants lose their leaves and their energy descends into the roots, rather than the branches.

Now, how does the Solstice impact cultural life on Earth?

Welcome to Ra Optics, where science meets style in the world of eyewear.

The result?

A fusion of function and fashion.

In a recent study (the largest ever) on the impact of artificial light exposure on mental health, scientists found the most comprehensive evidence to date on the damaging effects of artificial (especially blue) at various times of the day.

Clearly…Ra Optics’ mission has never been more relevant.

Here is what you need to know about the latest Science of Light: 

In today's fast-paced, tech-driven world, we're constantly surrounded by screens and artificial lights. Although these advancements have revolutionized our daily lives, they've also introduced a new set of challenges for our health that our species has never faced. One of the most significant of these challenges is the exposure to blue light. So… what exactly is blue light?

And why is it a concern?

Let's dive deep into the science and discover what we can do to protect ourselves from the damaging blue light that is rampant in our modern environments.