With summer coming I have started looking for new sunglasses and I am unsure about what lens material is best for me. Why would I choose plastic over glass, for example?
So, you’re planning to invest in new sunglasses! Protecting your eyes from ultraviolet radiation with good quality sunwear is a fantastic idea. Let’s talk about different lens materials to give you an overview of the pros and cons of the three main types: glass, resin plastic (often called CR-39), and polycarbonate.
Glass offers exceptional clarity and is highly scratch-resistant. Some of the highest-end non-prescription sunglasses use glass lenses for their crisp, clear view. However, they are heavier than plastic options, and can be uncomfortable for individuals sensitive to the weight of their eyewear. Also, glass is more prone to breaking on impact, making it less ideal for wearing during activities where dropping them or getting hit in the face is a possibility.
Resin plastic, or CR-39, is a popular choice in many ophthalmic sunglasses because it is lightweight and offers good optical clarity, though not quite as sharp as glass. It’s also more impact-resistant than glass, providing a better degree of safety. While it scratches more easily than glass, scratch-resistant coatings can significantly improve its durability. Plastic lenses give the wearer a great balance of quality and practicality for everyday use, and for this reason it is a common material used in manufacturing both prescription and non-prescription sunwear.
Finally, we have polycarbonate lenses. These are the champions when it comes to impact resistance, making them an excellent choice for sports, safety glasses, and children’s eyewear. They are also very light and naturally offer UV protection. The trade-off is that they can have slightly less optical clarity compared to glass or CR-39, and they are more susceptible to scratches, although again, coatings help mitigate this. Polycarbonate is the material of choice for both prescription and non-prescription sunglasses when safety or minimizing weight is paramount.
An optical professional can further explain the various options and help you find the perfect fit, so either book an appointment for a consultation or just come in and check out the latest styles for the season. If you require visual correction in your sunglasses, bring your current prescription with you, or if you are due for an exam, schedule an appointment with your optometrist to have your eye health checked and get an up-to-date prescription. This information will be crucial in guiding you to the best choice to protect your eyes. Then bring on the sun!
