The color depth of sunglasses and eye protection ability is not a simple positive correlation, the following is the specific analysis:
Sun glasses color action principle
The color of sunglasses is mainly through the absorption and reflection of different wavelengths of light to achieve a specific effect. For example, gray lenses can evenly absorb all wavelengths of visible light, maintaining natural color perception; The green lens has a relatively high transmittance of green light and a certain absorption of other light; The yellow lens mainly absorbs short wavelength light such as blue light to enhance contrast.
The relationship between color depth and eye protection
The advantage of deep color: In general, dark sunglasses can block more visible light and some ultraviolet light to a certain extent, in the strong light environment, such as the beach in the sun, high altitude snow and other scenes, dark lenses can reduce the amount of light into the eyes, reduce glare, make the eyes feel more comfortable, reduce squinting caused by strong light stimulation, eye fatigue and other problems.
Limitations of dark colors
Not effective for all light: the color shade mainly affects the transmittance of visible light, and the blocking ability of ultraviolet light is not entirely dependent on the color shade. The effect of UV protection mainly depends on the material of the lens and whether there is a special UV protection coating. Even the very deep color of the lens, if there is no good anti-ultraviolet function, it can not effectively block the damage of ultraviolet rays to the eyes. Long-term exposure to ultraviolet light may cause eye diseases such as cataracts and macular degeneration.
May affect visual clarity and safety: too dark lenses will excessively reduce the light transmittance, so that the visual environment becomes too dim, may lead to decreased visual clarity, especially in the dark light environment or in the evening, will affect the observation and judgment of the surrounding environment, increase the safety risk of walking, driving and other activities. For example, when driving, if the sunglasses are too dark, it may be difficult to see traffic lights, road signs, and the dynamics of surrounding vehicles and pedestrians, which is easy to cause traffic accidents.
When choosing sunglasses, it is not possible to judge its eye protection ability simply by color depth, but priority should be given to whether the lens has a good UV protection function (usually identified as UV400, etc.), and at the same time, combine their own use scenarios and needs to choose the right color and depth of the lens.
Post time: Feb-18-2025