Yellow lenses filter high-energy blue light while maintaining color accuracy and clarity—ideal for daytime use. Red lenses block both blue and green light wavelengths, which is more effective for evening use when you want to support your body's natural melatonin production.

While you can, we don't recommend it. Red lenses significantly alter color perception, which can affect productivity and isn't practical for most daytime activities. Yellow lenses are designed specifically for daytime screen use while maintaining natural vision.

We recommend switching to red lenses 2-3 hours before your intended bedtime. This gives your body time to naturally increase melatonin production. Many customers switch when the sun goes down or after dinner.

Our glasses are designed to fit comfortably over most prescription glasses. They're lightweight and have enough clearance for standard frames. If you wear larger prescription frames, please contact us to confirm fit.

Orders ship within 1-2 business days from our U.S. warehouse. Standard shipping typically takes 3-5 business days. Expedited shipping options are available at checkout.