Sleep-V2 red glasses against blue and green light

Key features of the Sleep-V2 glasses

• Red colour of the glasses blocks 99.9% of the blue and 99% of the green spectral components
• Unlike the basic Sleep-1 version, these glasses have comfortable, adjustable arms
• The glasses block light from all sides
• The glasses are lightweight and easily portable
• Robust construction ensures a long lifespan
• Universal size for adults
• Can be worn over prescription glasses
• Clear glasses do not eliminate most of the blue light spectrum, nor the green; if the glasses are working correctly, both spectra should appear the same when viewed through them, and blue should be invisible and green minimal
• Colour spectrum for a home test of blue light blocking glasses: The glasses filter out blue light if both colour spectra match (when viewed through the glasses)
• The glasses also filter the green spectral component if the green colour appears faded

Glasses against blue light can be categorised as follows
Clear (colourless) glasses – eliminate at best the violet colour and 0% of blue and 0% of green (see test below)
Yellow glasses – eliminate approx. 50% of blue light (depending on the shade)
Orange glasses – eliminate 99% of blue and part of the green spectrum
Red glasses – eliminate 99.9% of blue and 99% of the green spectrum that negatively affects the circadian rhythm

Clear glasses cannot absorb the blue and green spectral components. Why? If the entire light spectrum passes through an object (in this case, glasses), our eyes perceive the object as clear (colourless). If blue and green light do not pass through the object, meaning only yellow to red light passes through, the object (the lens of the glasses) appears red. It follows from this that it is physically impossible for clear (colourless) glasses to filter the blue and green spectral components.