Glass versus plastic sunglass lenses

If you’re in the market for a new pair of sunglasses, you’ve probably realized that there are plenty of lens options available — namely, glass and plastic. But do glass or plastic lenses make more sense for sunglasses?

Glass lenses are a classic choice and provide optimum clarity. But they can be really heavy, and if you’ve got a prescription, they get even heavier. Not to mention glass lenses are not the safest choice for eyewear, especially for kids. 

Plastic lenses tend to be the more popular option, especially when it comes to plano (non-prescription) sunglass lenses, but there are variations in quality which should be a consideration. 

Before you make a sunglasses decision, take a look at the benefits and limitations of both glass and plastic lenses. When it’s time to select a new pair of shades, it will be much easier to make the right choice.

Once upon a time, glass lenses were the only option for eyeglasses, including sunglasses. But a lot has changed, and according to The Vision Council, less than 6 percent of glasses sold today are made of glass.

Glass lenses may not be as common as they once were, but they still offer exceptional optics, plus they are more durable and less prone to distortion. With clearer, longer-lasting clarity than other lens materials, glass lenses are a great choice for those who rely on their sunglasses all day or must perform detailed work outdoors. 

Because glass lenses are prone to crack and shatter, they are typically not a good option for children, teens or sports activities. On the other hand, glass lenses are great for adults with stronger prescriptions, as glass lenses have become much thinner and are therefore the better option. 

Although glass-lens sunglasses remain one of the highest quality options on the market, they’re also heavier than plastic lenses and can limit your selection of frames. For example, glass lenses would not be an option for semi-rimless or rimless sunglasses. 

The first plastic eyeglass lenses were introduced by Armorlite Lens Company in California in 1947. While there have been numerous advances in eyeglasses since then, CR-39 plastic is still known for its excellent optical quality, durability and low cost.

A primary benefit of plastic lenses is how easily they allow for lens treatments like tinting and UV protection. Plastic lenses also can be coated to protect against scratches, but keep in mind, neither glass nor scratch-resistant plastic lenses are 100% scratch-proof. 

Plastic lenses also lead the way in terms of safety and durability. These lenses pose a lower risk of injury, making them better suited for children, teens and active adults.

Plastic is also cheaper and lighter weight than glass, which is why the vast majority of non-prescription sunglasses and clip-on sunglass lenses are made of this inexpensive-yet-durable material.