What do different lens types mean in sunglasses?

Different lens types in sunglasses refer to the material, coating, and color of the lenses, each with its own benefits and uses. Here's a breakdown of what different lens types in sunglasses mean:

1. Polycarbonate lenses: Polycarbonate lenses are made from a durable and impact-resistant plastic material, making them a good choice for sports or other activities where durability is important.

2. CR-39 lenses: CR-39 lenses are made from a lightweight plastic material and offer good optical clarity, making them a popular choice for sunglass lenses.

3. Glass lenses: Glass lenses provide excellent optical clarity and scratch resistance, but they're heavier and more fragile than other lens materials.

4. Polarized lenses: Polarized lenses have a special coating that reduces glare from surfaces like water or snow, making them a good choice for outdoor activities like fishing, boating, or skiing.

5. Photochromic lenses: Photochromic lenses, also known as transition lenses, darken automatically in response to sunlight or UV rays. They're a convenient option for people who spend a lot of time outdoors, as they can provide both clear and tinted vision in changing light conditions.

6. Gradient lenses: Gradient lenses are darker at the top and lighter at the bottom, providing protection from the sun while allowing for clear vision at the bottom of the lens. They're a good choice for activities like driving or reading outside.

7. Mirror-coated lenses: Mirror-coated lenses have a reflective coating that reducesthe amount of light that enters the eye, making them a good choice for bright or sunny conditions.

8. Prescription lenses: Prescription sunglass lenses can be made to correct your individual vision needs, providing both vision correction and sun protection.

The color of the lenses can also affect how they perform. For example, gray lenses reduce brightness without altering colors, while brown lenses enhance contrast and depth perception. Amber or yellow lenses are good for low-light conditions, while green lenses provide good color contrast and clarity.

Overall, choosing the right lens type for your sunglasses depends on your needs, preferences, and the activities you'll be doing while wearing them. Consider factors like durability, visual clarity, and sun protection to help you choose the right type of lens for your sunglasses.