08/11/2026
CrossFit belts: how to choose the right one for lifting and strength
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Read articleBy Miguel Chamorro · Published 27/10/2026
Understand the difference between red and yellow lenses, when to use each one and why a day-and-night system can be more practical.

The main difference is the intensity of the filter and the moment of use. Yellow lenses are designed for daytime screens and artificial lighting while preserving a more natural view. Red lenses provide stronger filtering for the last hours of the day.
Choose yellow lenses when you still need to work, study, train or use screens. They reduce part of the shorter wavelengths without changing colour perception as strongly as red lenses.
Red lenses are more specific to evening routines, late screen use, travel or spaces where you cannot control artificial lighting. Their stronger tint changes colour perception more noticeably.
Lens colour alone does not reveal the exact filtering level. The most useful information is the real spectral-transmission data for each lens.
There is no universal winner: use the level of filtering that fits the time of day. Explore the THEYET blue-light glasses collection to compare day and night options.
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