What they do (and what they don’t).
Yellow lenses filter part of the blue light in the visible spectrum. This produces two real effects: they increase perceived contrast and reduce the amount of light reaching the eye.
The first effect is useful in several situations. The second determines when it makes sense to wear them.
What are they good for?
- Intensive screen use, especially at the end of the day. They reduce perceived eye strain during long sessions in front of a computer or mobile phone.
- Low daylight conditions: fog, rain, cloudy days, dusk. They filter scattered blue light that creates visual haze and improve edge definition.
- Driving in rain or fog. Some drivers report greater subjective comfort in these conditions. They do not objectively improve night vision, but the perceived comfort is real for many people.
- Low-light sports: hunting, cycling, skiing. They help identify changes in terrain and silhouettes against complex backgrounds.
What don't they work for?
- Sun protection. Yellow tint does not protect against ultraviolet radiation. For that, you need UV400, which can be combined with the yellow lens.
- Objective nighttime vision on the road. By reducing the available light, they can make it harder to see clearly in very low-light conditions. Do not use them as a solution for seeing better at night.