Introduction

When it comes to disposing of your old eyewear, particularly the plastic lenses, it can be confusing to determine the right course of action. You may wonder, 'Can I throw plastic lenses in the recycle bin?' The short answer is no, you should not throw them in the regular recycling bin. This guide will help you understand why and provide alternative methods for proper disposal.

Why Not in the Regular Recycling Bin?

Most plastic lenses used in glasses are made from materials not widely accepted in standard recycling programs. While some types of plastic lenses, such as polycarbonate, are recyclable, the small quantity from individual consumers is usually not worth the recovery effort.

What Are the Alternatives?

Returning to an Optician

Many optical shops have recycling programs for old lenses and frames. They can often take your old lenses and frames to be repurposed. This process is not only environmentally friendly but may also benefit you financially, as you might receive a small credit for your old lenses.

Specialized Recycling Programs

Check if there are local or national recycling programs specifically designed for eyewear. These programs can provide you with a convenient way to dispose of your old lenses and frames safely and responsibly.

Reuse or Donate

If your lenses are still in good condition, consider reusing them or donating them. Some organizations may accept donated glasses and lenses for individuals in need. This is not only helpful to others but also reduces waste.

Understanding the Recycling Process

Not all plastics are created equal, and CR-39, the most common material used in ophthalmic lenses, is not recyclable in standard recycling processes. Polycarbonate, on the other hand, is recyclable but not practical for small quantities from individual consumers. Here’s a breakdown of why:

CR-39.

CR-39 is a thermoset plastic commonly used in eyewear lenses and is not recyclable in standard recycling processes. This material is not exothermic, meaning it does not break down into separate components that can be reused. Once it is formed, it cannot be recycled.

Polycarbonate.

Polycarbonate, known for its high impact resistance, is recyclable but only economically viable when recycled on a large scale, such as from industrial manufacturing waste. If you have a pair or two of lenses, the effort needed to process them is not worth it for local recyclers. Even larger quantities, like those produced in industrial settings, are difficult to manage and are often not recyclable by small-scale facilities.

For a better understanding, my husband owned a small ophthalmic finishing lab until early 2019. His edger for polycarbonate lenses produced significant amounts of 'swarf' (waste particles). Although recyclers would not take this material even in large quantities, the process still generated significant 'swarf' waste. Large scale manufacturers of consumer products, such as water bottles, regularly recycle poly but small quantities from individual consumers are not economically feasible.

Conclusion

Proper disposal of plastic lenses from your eyewear is crucial for reducing waste and helping the environment. Whether you choose to return your lenses to an optical shop, participate in a specialized recycling program, or donate them, you can make a positive impact. Remember to always check local recycling guidelines to ensure you are disposing of your lenses safely and responsibly.