Cal (Day)

Cal (Day) is the frame for the cooler younger sibling — a clean, classic oval silhouette reimagined for daytime blue light filtering. Clear or lightly tinted lenses filter the high-energy blue wavelengths from screens and LED lighting while preserving natural color perception, giving kids the same quality of light protection as adults.

• Clean, classic style: A sturdy black oval frame with easy, confident appeal.
• Daytime blue light filtering: Reduces harmful artificial blue light from screens and LED lighting while preserving natural color perception.
• Designed for youth: A comfortable frame kids actually want to wear.
• Fits your routine: Available in Non-Prescription, Readers, and Prescription options.

At BioSpectral Systems we believe you were never separate from nature. Choose Cal (Day) to help reconnect your child's body with the signals of life.

Independently lab-tested: 100% of the blue light hazard range blocked, 80% visible light preserved

Cal (Day) uses BioSpectral's Day lens technology, independently spectrometer-tested: it blocks 100% of light in the 435–475nm "blue light hazard" range, 97% of blue light overall, while still passing 80% of visible light — among the clearest daytime blue-light-blocking lenses independently tested. See the full independent comparison data.