The glasses that changes its color when outdoors
Transition glasses are made up of sensitive photo chromatic lens capable of changing its color depending on the intensity of sunlight available. Usually a transition lens change color when they encounter UV rays from the sun. It gets more darken as the UV rays grows stronger but remains colorless when there is no UV radiation. Thus they look like ordinary glasses during night. Each time you use the lens there is a decrease in the count of its micelles and when all the micelles are gone the lens stops changing its color. The expectancy of a transition ranges from two to three years depending on their use in such environment and their quality.
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