Our Day/Night transitions lenses for the motorcycle rider, bicycle rider, and for everyday use. These lenses react to the amount of available UV light and adjust accordingly. These lenses darken as the day becomes brighter and clear up as daylight fades to night . These lenses transition quickly, going from clear to dark in 5 seconds and dark to clear in 10 seconds. Now you can have one pair of fully functional glasses for all lighting conditions, whether it is day, night, or anywhere in between. No need to pull over to change your glasses as the time of day changes; you can continue riding and let your glasses work for you. WILL SHIP WITHIN 24 HOURS. Transitions is the trademark of Transitions Optical Inc. transition won't be too dark due to the fact that while riding into a tunnel, riders expected the lenses can transition fast enough from dark to clear to prevent collision or accident. Therefore the lenses won't be too dark under the sunlight so it can transition quickly.
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