Clyde Sunset

Sunset Lenses are designed to be worn from sunset until bedtime, or at least three hours before sleep, for optimal results. They support your body’s natural circadian rhythm, the internal “clock” that synchronizes biological functions with the day-night cycle.

Historically, the setting sun triggered melatonin production, slowing metabolism and supporting cellular repair. Modern artificial light disrupts this process, signaling your brain that it’s still daytime, reducing melatonin, making it harder to fall asleep, and limiting restorative repair. Chronic disruption can contribute to fatigue and long-term health risks.

By wearing Sunset Lenses as directed, you help your body wind down naturally, fall asleep more easily, sleep more deeply, and wake up feeling refreshed and energized.

Our Sunset Lenses are designed to filter the blue light wavelengths that stimulate the brain and body in the evening. By removing this sleep-disrupting light, Sunset helps the nervous system relax, supports natural melatonin release, and makes it easier to fall asleep and stay asleep.

By significantly reducing high-energy blue light exposure at night, Sunset also eases visual stress from screens and artificial lighting, allowing the eyes to recover during their natural repair window. For evening screen use, indoor lighting, or the final hours before bed, Sunset is the optimal choice for protecting sleep, recovery, and next-day energy.

Sunset Lenses can be worn during the day, but their high level of filtration reduces light and color perception. This may make color-sensitive tasks more challenging and can cause drowsiness when alertness is required.

Recommended daytime use for Sunset Lenses:

• In environments with intense artificial lighting, such as hospitals or offices.
• Outdoors under strong sunlight, providing short-wavelength protection while retaining longer, near-infrared benefits.

Sunset Lenses were originally designed to enhance evening relaxation and sleep quality. 

Daylight Lenses were developed for daytime use to filter blue light from screens and artificial lighting, and can also serve as a lighter evening option for those who prefer less tint.

Evening scenarios for Daylight Lenses:

• Late meals, when color perception is important.
• Ideal for social settings where natural color clarity and light protection are needed.
• Nighttime driving.
• Gradual transition to Sunset Lenses.

For optimal blue-light management, use Daylight Lenses during the day and Sunset Lenses at night—a complete system supporting both alertness and restorative rest.

Sunset Lenses are designed to simulate natural post-sunset lighting by significantly reducing brightness—blocking 77% of light and allowing only 23% to pass through. This reduction supports circadian rhythm alignment but can influence vision in low-light conditions.

Natural Vision Changes in Low Light
In dim environments, the eyes rely more on rod cells, which are highly light-sensitive but provide less sharp central vision, leading to slightly blurrier perception.

Pupil Dilation and Depth of Focus
As ambient light decreases, pupils widen, reducing depth of field and making it more challenging to maintain sharp focus—particularly with lenses that reduce brightness.

Reading Glasses OptionFor close-up tasks, consider Sunset Lenses with built-in magnification. These maintain circadian benefits while enhancing clarity for reading.

They exhibit a complete cut-off around 500 nm, with less than 5% transmission until approximately 550 nm. Allowing a small amount of light through this range enhances color perception and overall comfort, without transmitting enough short-wavelength light to disrupt sleep or circadian rhythm—the peak sensitivity of which is near 479 nm (the melanopsin absorption spectrum). Beyond 550 nm, transmission rises steeply, reaching near-full levels around 600 nm.