TR9308HKCH Lightweight Photochromic Sunglasses with Visible Light Changing Lenses Inside a Boston Classic Retro UV with Nose Pads Dark [OTC.web] (Even

These photochromic lenses change color in response to ultraviolet and visible light. They are almost colorless indoors, but change color when exposed to sunlight outdoors. Regardless of the degree of color change, they block almost 100% of ultraviolet rays. This visible light photochromic lens type reacts not only to ultraviolet light but also to visible light, so it will even color inside a car with UV protection. Furthermore, considering eye health, it blocks almost all ultraviolet rays, which are said to be one of the causes of cataracts. It also reduces eye strain caused by the glare of the sun. These are stylish and eye-health-conscious lenses. These are stylish Boston-style photochromic lenses that change color depending on the amount of light. These are stylish Boston-style polarized sunglasses. The front of the frame is made of TR90, a medical-grade resin, making it lightweight (approximately 14g) and durable. The temples are made of high-quality metal and have nose pads to prevent slipping. Inside a car, the lenses will have a moderate tint (approximately 40-50% density) *they will not become completely dark. Car windshields have UV protection. Ordinary photochromic lenses change color in response to ultraviolet light, so they were not effective inside a car. HOYA Senscity Dark lenses react to visible light, so they can be used inside a car. Outdoors, the lenses will have a dark tint (80-90% density). Ordinary photochromic lenses are easily affected by temperature changes, and do not darken as easily in high temperatures, but visible light photochromic lenses have a much higher tint density compared to ordinary photochromic lenses, and will perform well even in high-temperature environments. A lens cleaning cloth and folding case are included as a service. Lens size: width approx. 50mm, height approx. 46mm, bridge width approx. 19mm, temple length approx. 145mm, overall width 140-160mm, frame weight 14g. The frame is made of medical-grade resin for the front and alloy for the temples. The lenses and frame are made overseas, but the assembly is done domestically. Color Characteristics Reacts to the same light as ultraviolet light, as well as visible light. Therefore, the lens color will change even inside a car with UV protection. Color Development Speed After reacting to ultraviolet light, the color darkens within approximately 90 seconds, quickly becoming like sunglasses. Fading Speed The fading speed has also been improved, and the color fades about twice as fast as conventional lenses. Factors Affecting Density Amount of ultraviolet light The more ultraviolet light there is, the darker the color tends to develop. Temperature The lower the temperature, the darker the color will be, and fading may take longer. For example, the color tends to darken more easily in winter than in summer. Density Inside a Car Inside a car, depending on the lighting conditions, the lenses will be tinted to a moderate density, but will not reach the maximum density. This is also affected by the material of the windshield, whether the windows are open or closed, and the position of the seat. These are stylish Boston-style photochromic polarized sunglasses. The front of the frame is made of TR90, a medical-grade resin, making them lightweight (approximately 19g) and durable. The temples are made of high-quality metal and have nose pads to prevent them from slipping down.