What are the differences in choosing sunglasses for people of different ages

Choose sunglasses for children under 6 years of age and pay attention to lighter colors. There are no other special requirements. In people over the age of 40, the nucleus of the lens begins to harden, and the cortex begins to expand, causing the anterior chamber to become shallow. After wearing sunglasses, the amount of visible light entering the eye decreases, the pupils naturally open, and the iris tends to accumulate in the angle of the room, blocking the outflow passage of aqueous humor. Over time, it can easily induce acute episodes of angle-closure glaucoma, causing symptoms such as redness, eye pain, and sharp decline in vision. This is particularly true for people with a history of glaucoma or a family history of glaucoma patients. Therefore, people with glaucoma or suspected glaucoma should not wear sunglasses, and those over the age of 40 who wear sunglasses for a long time should also be cautious.

The color selection of lenses should be based on the principle that the color of the surrounding environment is not distorted, the edges of objects are clear, and different color signal lamps can be effectively identified. The colors of lenses are gray, tan, and green, as these colored lenses absorb infrared and ultraviolet rays better. Gray lenses can absorb any color spectrum evenly, and the scenery seen after wearing them will only darken without significant color difference; Brown lenses can filter out a large amount of blue light and improve visual contrast and clarity. They are especially effective when worn in severe air pollution or foggy conditions.