New Contact Lens Update Focuses on Sustainability for Practices, Manufacturers, Patients

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WATERLOO, Ontario, April 29, 2025—As the “Earth Month” comes to a close, the Centre for Ocular Research & Education (CORE) has published a new guide to help practice staff and manufacturers minimize environmental impact year-round. Issue 83 of Contact Lens Update focuses on contact lens-related sustainability initiatives, wearer attitudes, and practical patient education. The bi-monthly publication is available at no charge by visiting ContactLensUpdate.com.

“There is growing attention to sustainable practices in eye care, driven by patient demand, practitioner awareness, manufacturer innovation, and evolving retail standards. The latest issue of Contact Lens Update highlights several of the most important opportunities for practices to engage with contact lens patients about environmental effects, proper disposal and recycling, and available programs to minimize impact of wear,” said Lyndon Jones, director of CORE.

Sarah Smith’s opening editorial provides evidence- based research to help guide patient conversations regarding the amount of waste generated by different lens replacement modalities. A research optometrist with Eurolens Research at The University of Manchester (Manchester, England), she also explores contact lens recycling programs and describes how the recycled plastic is given a new lease on life. In addition, Smith shares straightforward advice on ways to make practices more sustainable.

The feature article is written by Alison Ng, a lecturer at the School of Optometry & Vision Sciences at Cardiff University (Cardiff, Wales) and adjunct associate professor at the School of Optometry & Vision Science at the University of Waterloo. She summarizes a review surrounding the environmental effects of contact lenses, the vital role that practitioners serve in educating patients about sustainability, and the future of environmentally-friendly contact lenses.

The conference highlight comes from Sarah Mastrorocco, an optometrist at Walterboro Eyecare Center (Walterboro, South Carolina). She conducted an online survey at the Southern College of Optometry in Memphis, Tennessee, investigating how concerned soft contact lens wearers were about the environmental impact of lenses, whether they were aware of the university’s contact lens recycling program, their willingness to recycle their lenses at the school, and whether a company’s or practice’s commitment to recycling influenced their choice of product or eye care practitioner.

To help increase patient awareness of sustainable contact lens practice, CORE has created downloadable handouts for practitioners to use in this issue’s clinical insight column. These are ideal for in-office digital or hard copy display, staff training, and inclusion in take-home materials for new and existing contact lens patients.

Contact Lens Update Issue 83 follows CORE’s recent introduction of a first-of-its-kind eye care sustainability website: SustainableEyecare.com. A wealth of resources is available at no cost on the site to eye care practitioners, educators, manufacturers, students, and consumers.

In addition to a complete archive of back issues, ContactLensUpdate.com offers a resource library that provides no-cost professional tools, patient resources, images and video. It also houses complimentary technical training videos produced by International Association of Contact Lens Educators, plus an industry glossary. Industry professionals can access the latest issue directly from ContactLensUpdate.com or quickly sign up for email receipt of future issues.

The publication receives support from the educational arms of Alcon, CooperVision, and Johnson & Johnson Vision.

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About the Centre for Ocular Research & Education (CORE)
The Centre for Ocular Research & Education (CORE) was established in 1988 at the University of Waterloo’s School of Optometry & Vision Science. Over the next three decades, the organization evolved from a three-person operation into a thriving hub of basic and applied research, collaborating with sponsors, agencies and academia on advanced biosciences, clinical research and education. Its uncompromising independence and results of the highest quality have been at the heart of many of the most prominent advances in eye health. Today, its team serves a range of ophthalmic sectors, including medical devices, ocular pharmaceuticals, digital technology and others, with a focus on the anterior segment. For more information, please visit core.uwaterloo.ca.


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WATERLOO, Ontario, April 29, 2025—As the “Earth Month” comes to a close, the Centre for Ocular Research & Education (CORE) has published a new guide to help practice staff and manufacturers minimize environmental impact year-round. Issue 83 of Contact Lens Update focuses on contact lens-related sustainability initiatives, wearer attitudes, and practical patient education. The bi-monthly publication is available at no charge by visiting ContactLensUpdate.com.



The feature article is written by Alison Ng, a lecturer at the School of Optometry & Vision Sciences at Cardiff University (Cardiff, Wales) and adjunct associate professor at the School of Optometry & Vision Science at the University of Waterloo. She summarizes a review surrounding the environmental effects of contact lenses, the vital role that practitioners serve in educating patients about sustainability, and the future of environmentally-friendly contact lenses.

The conference highlight comes from Sarah Mastrorocco, an optometrist at Walterboro Eyecare Center (Walterboro, South Carolina). She conducted an online survey at the Southern College of Optometry in Memphis, Tennessee, investigating how concerned soft contact lens wearers were about the environmental impact of lenses, whether they were aware of the university’s contact lens recycling program, their willingness to recycle their lenses at the school, and whether a company’s or practice’s commitment to recycling influenced their choice of product or eye care practitioner.

To help increase patient awareness of sustainable contact lens practice, CORE has created downloadable handouts for practitioners to use in this issue’s clinical insight column. These are ideal for in-office digital or hard copy display, staff training, and inclusion in take-home materials for new and existing contact lens patients.

Contact Lens Update Issue 83 follows CORE’s recent introduction of a first-of-its-kind eye care sustainability website: SustainableEyecare.com. A wealth of resources is available at no cost on the site to eye care practitioners, educators, manufacturers, students, and consumers.

In addition to a complete archive of back issues, ContactLensUpdate.com offers a resource library that provides no-cost professional tools, patient resources, images and video. It also houses complimentary technical training videos produced by International Association of Contact Lens Educators, plus an industry glossary. Industry professionals can access the latest issue directly from ContactLensUpdate.com or quickly sign up for email receipt of future issues.

The publication receives support from the educational arms of Alcon, CooperVision, and Johnson & Johnson Vision.

# # #​


About the Centre for Ocular Research & Education (CORE)
The Centre for Ocular Research & Education (CORE) was established in 1988 at the University of Waterloo’s School of Optometry & Vision Science. Over the next three decades, the organization evolved from a three-person operation into a thriving hub of basic and applied research, collaborating with sponsors, agencies and academia on advanced biosciences, clinical research and education. Its uncompromising independence and results of the highest quality have been at the heart of many of the most prominent advances in eye health. Today, its team serves a range of ophthalmic sectors, including medical devices, ocular pharmaceuticals, digital technology and others, with a focus on the anterior segment. For more information, please visit core.uwaterloo.ca.


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The chances of me ever taking the extra time to educate patients about environmental sustainability with their contact lenses are slim and none and slim has already left town.
 
I participate in the B&L One by One recycling program for blister packs and CLs, and I have a growing number of patients bringing back their empties. They accept all brands, not just B&L. When a box is full, I download a prepaid UPS label and send it out.
 
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I had Grok do the math accounting for the extra plastic used in cases and bottles of solution as well as the impact of shipping heavy bottles of solution regularly for reusable contact lenses and daily disposables have a significantly lower environmental impact.


1. **Waste from Contact Lenses and Packaging**
- **Daily Disposable Lenses**: An annual supply (730 lenses for both eyes) generates ~1 kg of plastic waste (lenses, blister packs, foil, cartons).
- **Reusable Lenses**: Monthly replacement (24 lenses/year) generates ~0.87 kg of waste (lenses and packaging), excluding solution and cases.

2. **Contact Lens Solution (Reusable Lenses Only)**
- Reusable lenses require 10–12 bottles of multipurpose solution (MPS) annually (300–360 mL per bottle), contributing ~4–4.8 kg of plastic waste (0.4 kg per bottle).

3. **Contact Lens Cases (Reusable Lenses Only)**
- Monthly case replacement (12 cases/year) generates ~1 kg of plastic waste (0.083 kg per case).

4. **Transportation and Carbon Footprint**
- **Daily Disposables**: If a full year’s supply (or six-month supply) is shipped once or twice annually, transportation emissions are minimized. A single shipment of lightweight lens packs (weighing ~1–2 kg total, including packaging) has a lower carbon footprint than frequent shipments of heavier items. For example, shipping 730 lenses in one box via ground transport produces emissions based on distance and mode (e.g., ~0.5–2 kg CO2e for ground shipping over 1,000 miles, though exact figures depend on logistics).
- **Reusable Lenses**: Typically require one or two lens shipments per year (similar to daily disposables with bulk purchasing), but the 10–12 bottles of solution add significant transportation impact. Each bottle weighs ~0.3–0.4 kg (liquid + plastic), so 3.6–4.8 kg of solution is shipped annually, often in multiple deliveries (e.g., monthly from retail or online subscriptions). This is heavier and bulkier than lens packs, leading to higher emissions (e.g., ~2–5 kg CO2e for multiple ground shipments, assuming similar distances).
- **Comparison**: With bulk purchasing, daily disposables now have a clear transportation advantage due to fewer, lighter shipments compared to the frequent or heavy shipments of solution for reusable lenses.

5. **Improper Disposal and Microplastics** (Unchanged)
- Daily disposables produce more lenses (730 vs. 24), increasing microplastic risk if flushed (~19–21% of users do this). Recycling programs mitigate this for both types.

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###Quantitative Comparison

#### Plastic Waste
- **Daily Disposable Lenses**:
- Lenses and packaging: ~1 kg/year.
- **Total**: ~1 kg of plastic waste.
- **Reusable Lenses**:
- Lenses and packaging: 0.87 kg/year.
- Solution: 4–4.8 kg/year (10–12 bottles × 0.4 kg).
- Cases: ~1 kg/year (12 × 0.083 kg).
- **Total**: 5.87–6.67 kg of plastic waste.

#### Carbon Footprint
- **Daily Disposables**: One or two shipments of ~1–2 kg (lenses + packaging) produce minimal emissions (e.g., 0.5–2 kg CO2e for ground shipping). Bulk purchasing reduces this further compared to frequent shipments.
- **Reusable Lenses**: One or two lens shipments (~0.5–1 kg CO2e) plus multiple solution shipments (3.6–4.8 kg total weight) produce higher emissions (e.g., 2–5 kg CO2e, depending on frequency and distance). The energy-intensive production of solution and bottles also adds to the footprint, though exact data is limited.
- **Edge**: Daily disposables have a lower transportation footprint with bulk purchasing, as solution shipments for reusable lenses are heavier and often more frequent (e.g., monthly retail or subscription deliveries).

#### Recycling
- Daily disposables: 100% recyclable via programs like TerraCycle.
- Reusable lenses: 78% recyclable (lenses, cases, bottles) via curbside programs, but solution bottles are less commonly recycled. Daily disposables retain a slight recycling advantage.

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###Synthesis and Conclusion
With the adjustment that daily disposable lenses are purchased in a single annual (or biannual) shipment, their environmental advantage over reusable lenses becomes even clearer:
- **Plastic Waste**: Daily disposables generate ~1 kg of waste vs. 5.87–6.67 kg for reusable lenses, primarily due to solution bottles and cases.
- **Carbon Footprint**: Bulk purchasing minimizes daily disposable shipments, making their transportation emissions (0.5–2 kg CO2e) lower than those of reusable lenses (2–5 kg CO2e), which involve heavier, often more frequent solution deliveries. Production emissions for solution further tilt the balance against reusable lenses.
- **Microplastics**: Daily disposables pose a higher microplastic risk if improperly disposed of, but recycling mitigates this.

**Final Answer**: Yes, daily disposable contact lenses have less environmental impact than reusable contact lenses when purchased in a full year’s (or six-month) supply, accounting for lenses, packaging, solution, cases, and transportation. They produce significantly less plastic waste (~1 kg vs. 5.87–6.67 kg annually) and a lower transportation carbon footprint due to fewer, lighter shipments. Recycling and proper disposal remain critical to minimizing the impact of either option.

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### Notes
- The transportation advantage assumes ground shipping and typical U.S. logistics. International or air shipping could increase emissions for both modalities.
- User behavior (e.g., recycling, flushing lenses) and regional recycling infrastructure affect outcomes. Check local programs for accessibility.
- Innovations like biodegradable lenses or eco-friendly packaging could further reduce the impact of daily disposables in the future.
 
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