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Our supply of dorzolamide, long a first-line glaucoma therapy used alone or in fixed combination with timolol, has recently proven unreliable.

Breaking down the dorzolamide shortage

Selective laser trabeculoplasty (SLT) should be offered to patients diagnosed with open-angle glaucoma as a first-line therapy.

Perspective: New data support first-line use of SLT for glaucoma

A recurring feature at the 2024 American Society of Cataract and Refractive Surgery (ASCRS) Annual Meeting in Boston, Massachusetts, was the call for environmentally friendly practices worldwide, with the goal of decreasing the impact of ophthalmic surgeries on the planet.

A driving force in this movement is EyeSustain

 an organization dedicated to the development of such friendly environmental practices, that exists as a global coalition of eye societies providing education and resources to support sustainable practices in ophthalmology.

Here is a sampling of the ASCRS discussions on the topic.

Greening eye care: reducing ophthalmology’s environmental footprint

The presenters, led by first author Sarishka Desai, BA, described the EyeSustain platform and its 5-pronged mission: educate the global ophthalmic community about more sustainable practices, collaborate with industry to reduce our carbon footprint and surgical waste, support research and innovative solutions that reduce ophthalmology’s environmental impact, support advocacy and education about the public health impact of climate change, and collaborate with industry to reduce our carbon footprint and surgical waste.

Desai, of the University of Connecticut School of Medicine in Farmington, and colleagues presented EyeSustain’s approach to reducing the ophthalmic carbon footprint. She was joined in the study by Nitya Devireddy, BS, MPH, of Penn State College of Medicine in Hershey, Pennsylvania; Sofia Miguez, BA, of Yale School of Medicine in New Haven, Connecticut; and Barbara Erny, MD, of the Department of Ophthalmology at Stanford University in California.

The greenhouse gas data associated with health care are startling. Health care is responsible for 4.4% of all global greenhouse gas emissions, 71% of which arise from the manufacturing, use, and disposal of medical supplies. Ophthalmology has the highest procedural volume of any surgical specialty, with 50 million cataract surgeries expected to be performed globally each year by 2050, Desai reported.

In light of the procedural data, the authors highlighted 6 areas that are currently undergoing research and quality improvement initiatives through the EyeSustain system.

 of cataract surgeons and nurses by David Chang and Cassandra Thiel found that 93% of respondents believe that the trash associated with OR procedures is excessive, and that methods to reduce waste should be identified and implemented.

 encouraged regulatory agencies to allow electronic instructions for use be disseminated in lieu of the traditional paper instructions included with each cataract pack.

Ongoing projects spearheaded by EyeSustain members, including medical students and ophthalmology residents, are taking a look at educating surgeons and surgical staff about sustainability and the impact of OR waste, OR water consumption, and evaluation of flash sterilization associated with cataract surgery.

In recognition of the fact that medications in the OR represent an estimated $560 million in waste annually, a multisociety position paper

 recently formulated 3 key recommendations: topical drugs in multidose containers can be used for multiple patients in surgical facilities if proper guidelines are followed; topical drugs in multidose containers can be used until the manufacturer’s labeled date of expiration if proper guidelines are followed; and, when applicable, patients should be able to take their partially used medication home for postoperative use.

The Aravind Eye Care system’s low-carbon model from Madurai, India, uses alternate energy sources, transport, infrastructure, and equipment maintenance.

 Studying global systems of eye care and waste produced can provide a deeper understanding of the impact of hospitals and providers on climate change, as well as ideas on how western eye care systems can proactively reduce carbon emissions.

The EyeSustain platform includes ophthalmology-specific action steps for greening offices and clinics in collaboration with the 

Partnerships can be established with large manufacturers to reduce packaging, make instruments reusable, and streamline the manufacturing and distribution processes.

In addition to the impact of practice waste on the environment, EyeSustain also recommends studying the effects of climate change on the incidence rates of ophthalmologic conditions, including cataracts, allergic disease, and glaucoma, among others.

Desai and her colleagues recommended that institutions take the following steps:

Conduct a waste audit to quantify the carbon footprint of an institution’s OR emissions. This includes using the EyeSustain-Zasti Carbon Footprint Calculator, using the Sustainability Index for Disposables in Cataract Surgery calculator for cataract packs to evaluate the item-by-item potential for carbon dioxide savings, and surveying clinical staff to identify areas of perceived excess waste.

Identify key stakeholders at an institution and an enthusiastic, multidisciplinary team and completing the OR Sustainability Pledge (

), which has been completed by ambulatory surgery centers/hospital outpatient departments from 9 countries thus far.

Implement best practices; multisociety recommendations for sustainability are easily accessible at eyesustain.org and My Green Doctor for outpatient/clinic resources and local legislation using the American Academy of Ophthalmology Topical Medical Waste Reduction Act legislative template.

Using phacoemulsification waste to guide changes in surgical sustainability

Adjustments to improve the sustainability of ophthalmic surgical practice can have a large impact when scaled to case volume, according to author Margaret Tharp, BSc, who described this study at the ASCRS meeting. She and her coauthors Stella Protopapas, BA, MPH, and Minka Gill, BSc, are from the Indiana University School of Medicine in Bloomington, whereas David J. Palmer, MD, ABO, is from the Northwestern University Feinberg School of Medicine in Chicago, Illinois.

In their study, they sought to draw connections between results from a 24-hour waste audit at an outpatient surgical center and current resources available from EyeSustain to improve the sustainability of ophthalmic surgical practice.

The authors documented the extensive waste generated from 1 day of surgeries in an institution that included 13 phacoemulsification procedures, 5 plastic surgeries, 3 urologic surgeries, and 5 otolaryngologic cases. The waste products were sorted as medications (eg, propofol, eye drop containers), textiles (eg, surgical gowns, drapes), metals (eg, metal wiring, disposable instruments), and plastics (eg, hard, soft, wrappings).

When the amounts of the waste products were tallied, the authors found that “ophthalmology produced the greatest amount of waste in a single day relative to other operating specialties, despite producing the least amount of waste per case. Most ophthalmic waste was from textiles, hard plastics, and medications,” the authors reported.

The specific 13 phacoemulsification procedures resulted in 95.4 lb of waste broken down as follows: 18.5 lb of hard plastic, 5.5 lb of soft plastic, 8.3 lb of wrapping, 13.5 lb of medications, 41.2 lb of textiles, 6.7 lb of miscellaneous waste, and no metals. Compared with other operating specialties, ophthalmology produced the least amount of waste per case but the greatest amount of waste in total due to the relatively high case volume.

It has been reported that “discarded/unused pharmaceuticals from US cataract surgeries demonstrated waste of [approximately] $150 per case while generating carbon dioxide–equivalent emissions that approximated 25,000 to 100,000 flights from San Francisco, California, to Boston annually.

Small changes can have dramatic results. Tharp and colleagues suggested that the following would have positive consequences.

Revising the use of tetracaine bottles intraoperatively; for example, reusing the bottles between cases or sending the bottles home with patients

Optimizing packaging of surgical supplies and electronic instructions

Utilizing intravenous sedation to limit anesthesia gas carbon dioxide–equivalent emissions

Focusing on cutting waste also creates an opportunity to explore the practices of global leaders in sustainable eye care, such as the efforts of the Aravind Eye Hospitals, which provide similar surgical success rates at a fraction of the waste produced by US practices.

 A downside may be that such practices require significant reuse of materials, central sterilization, and stakeholder diligence, which can require complex interventions, according to Tharp. 

EyeSustain’s Surgical Facility Sustainability Pledge can serve as a guide for ophthalmologists to improve the sustainability of their practice in an approachable and lasting manner.

Factors contributing to the carbon footprint of cataract surgery

Omar Taboun, MSc, a medical student at Western University’s Schulich School of Medicine & Dentistry in London, Ontario, Canada, working under the direction of Netan Choudhry, MD, FRCSC, also described the negative impact of cataract surgery on the environment at the ASCRS meeting.

He commented, “We know that climate change can affect human health through various means, such as adverse weather events causing injury and exposure to pollutants [exacerbating] underlying health conditions. As health care providers, it is our responsibility to treat patients for their conditions that may ultimately be influenced by environmental factors. Counterintuitively, the health care sector is itself a greenhouse gas emitter,” Taboun said.

Surgery contributes significant emissions to the environment through the necessary materials and tools used during procedures. In addition, the need to maintain sterility increases waste.

The term footprint indicates the sum of all emissions direct and indirect resulting from this procedure, Taboun explained, the resultant value of which is typically reported in carbon dioxide equivalents

And although cataract surgery requires only a few minutes to complete, the procedural volume has increased exponentially over the past 2 decades,

Taboun and colleagues developed a 2-fold goal: they wanted to increase their understanding of the carbon footprint and waste accumulation to identify the primary contributors and pinpoint areas for improvement to enhance the sustainability of cataract surgery.

They conducted a literature search of PubMed, Google Scholar, and Medline to identify studies related to the carbon footprint and the elements of cataract surgery. The results yielded 6 studies, with 2 being the basis for this discussion,

He highlighted 3 main points extracted from the published data: the lowest footprint published was just under 6 kg of carbon dioxide equivalents; the highest published footprint was just over 180 kg of carbon dioxide; and the major factors contributing to the footprint include procurement of pharmaceuticals and materials, building and energy use, such as heating/cooling, lighting, electricity-powered tools, and travel by patients and staff to the location where the procedure is performed.

Taboun directed attention to centers that already have sustainable practices in place, such as the Aravind Eye Hospital, which reports the lowest footprint. These sustainable practices include the use of multiple operating tables in a single room; reusing gloves, gowns, and various medical equipment;

and using highly efficient autoclave settings.

Importantly, when these changes were implemented in the Aravind Eye Hospital,

 the rates of endophthalmitis remained comparable to other centers: 0.02% vs from 0.04% to 0.07% reported.

Taboun offered 3 ways that surgeons can offset the negative effects of cataract surgery on the environment—by focusing on procurement, energy use, and travel emissions.

Reduce emissions associated with procurement by collaborating with manufacturers to reduce packaging as much as possible and encouraging recycling in every OR.

Reduce building and energy use by incorporating renewable energy, such as solar panels, and more strategic lighting protocols and optimizing energy use within surgical centers.

Establish outreach clinics closer to more populous regions, whereby mostly staff members must travel, and patients less so, which will reduce travel emissions, along with performing bilateral procedures.

“Implementing sustainable practices, although challenging, will allow us to continuously provide this procedure and restore vision for millions of people at less of a cost to the environment,” Taboun said.

1. Chang DF, Thiel CL; Ophthalmic Instrument Cleaning and Sterilization Task Force. Survey of cataract surgeons’ and nurses’ attitudes toward operating room waste

. 2020;46(7):933-940.doi:10.1097/j.jcrs.0000000000000267

2. Schehlein EM, Hovasesian J, Shukla AG, Talley Rostov A, Findl O, Change DF. Reducing ophthalmic surgical waste through electronic instructions for use: a multi-society position paper. 

. 2024;50(3):197-200. doi:10.1097/j.jcrs.0000000000001381

3. Cleaning and Sterilization Task Force. Reducing topical drug waste in ophthalmic surgery: multisociety position paper

. 2022;48(9):1073-1077; doi:10.1097/j.jcrs.0000000000000975

4. Goel H, Wemyss TA, Harris T, et al. Improving productivity, costs and environmental impact in International Eye Health Services: using the ‘Eyeficiency’ cataract surgical services auditing tool to assess the value of cataract surgical services. 

. 2021 ;6(1):e000642. doi:10.1136/bmjophth-2020-000642. 2021

5. US EPA O. Greenhouse gas equivalencies calculator. United States Environmental Protection Agency. Updated January 2024. https://www.epa.gov/energy/greenhouse-gas-equivalencies-calculator

6. Gadani H, Vyas A. Anesthetic gases and global warming: [otentials, prevention and future of anesthesia. 

. 2011;5(1):5-10. doi:10.4103/0259-1162.84171

7. Thiel CL, Schehlein E, Ravilla T, et al. Cataract surgery and environmental sustainability: waste and lifecycle assessment of phacoemulsification at a private healthcare facility. 

. 2017;43(11):1391-1398. doi:10.1016/j.jcrs.2017.08.017

8. Pandey D, Agrawal M, Pandey JS. Carbon footprint: current methods of estimation. 

. 2011 ;178(1-4):135-160. doi:10.1007/s10661-010-1678-y

9. Pandey D, Agrawal M, Pandey JS. (2011). Carbon footprint: current methods of estimation. 

. 2011;178(1-4):135-160. doi:10.1007/s10661-010-1678-y

10 Rachmiel R, Trope GE, Chipman ML, Buys YM. Cataract surgery rates in Ontario, Canada, from 1992 to 2004: more surgeries with fewer ophthalmologists. 

11. Morris DS, Wright T, Somner JEA, Connor A. The carbon footprint of cataract surgery. 

. 2013;27(4):495-501. doi:10.1038/eye.2013.

12. Latta M, Shaw C, Gale J. The carbon footprint of cataract surgery in Wellington. 

13. Ravindran RD, Venkatesh R, Chang DF, Sengupta S, Gyatsho J, Talwar B. Incidence of post-cataract endophthalmitis at Aravind Eye Hospital: outcomes of more than 42,000 consecutive cases using standardized sterilization and prophylaxis protocols. 

. 2009;35(4):629-636. doi:10.1016/j.jcrs.2009.01.002

14, Pershing S, Lum F, Hsu S, et al. Endophthalmitis after cataract surgery in the United States: a report from the Intelligent Research in Sight registry, 2013-2017. 

. 2020;127(2):151-158. doi:10.1016/j.ophtha.2019.08.026

Organization eyes green practices, shifting ophthalmology landscape.

Minimizing the carbon footprint of ophthalmic surgeries

Join Dr. Bonnie An Henderson at the EnVision Summit 2025 in Puerto Rico, a family-friendly CME ophthalmology conference featuring the latest in eye care, optometry, and leadership.

EnVision Summit 2025 unites ophthalmology and optometry with family ties

The EnVision Summit, co-founded by Bonnie An Henderson, MD, is a unique family-friendly, multispecialty CME ophthalmology conference, along with a newly introduced optometry track. Held annually in Puerto Rico over President’s Day weekend, the 2025 event is scheduled for February 14–17 at the Caribe Hilton San Juan. 

Henderson describes the meeting as “a place where not only are physicians and optometrists learning, but their families are part of the experience too,” emphasizing the opportunity for personal and professional growth in a supportive, community-oriented environment.

Breaking news: MJH Life Sciences, parent of Ophthalmology Times, acquires EnVision Summit

The 2025 agenda will include symposia, surgical videos, panel discussions, and leadership seminars that highlight rapid advancements across ophthalmology specialties, including cataract, refractive, retina, glaucoma, pediatrics, and oculoplastics. 

“It’s incredible how quickly things change in ophthalmology—if you miss a year or two, you’ll be amazed by the innovations that have emerged,” Henderson shared. Updates on new intraocular lenses, surgical tools, and diagnostic techniques will showcase the field’s forward momentum. 

Additionally, a leadership seminar led by Malvina Eydelman, MD, Director of the Office of Ophthalmic, Anesthesia, Respiratory, ENT, and Dental Devices at FDA, Silver Spring, Maryland, will feature discussions on career pathways and diversity, empowering attendees with insights from industry leaders.

The optometry track, introduced last year, continues to expand, emphasizing collaboration between ophthalmologists and optometrists in critical areas like preoperative and postoperative care, medications, and diagnostic tools. As Henderson explained, “It's important for both fields to come together and discuss how we can work together to improve patient care.” This cross-disciplinary dialogue reflects the summit's dedication to advancing care through shared expertise.

The youth program offers age-appropriate activities that allow children to engage in fun learning while also witnessing their parents' professional contributions. "It’s amazing to watch these kids grow up at EnVision Summit and form lasting friendships,” said Henderson.

The trainee program, which offers free registration for residents, fellows, and medical students, has also seen growth. Henderson highlighted the program’s value, noting that it “gives young professionals the chance to network with leaders in the field and gain invaluable mentorship.”

To learn more about or to register for EnVision Summit 2025, 

Program director and co-founder Bonnie An Henderson, MD, sits down with Ophthalmology Times to talk about how the annual conference is a unique blend of cutting-edge science, professional growth, and community. The 2025 conference will take place February 14 to 17 at the Caribe Hilton San Juan, in Puerto Rico.

, an educational television series hosted by actress Meg Ryan, on a new episode addressing the public health crisis of cataract blindness, a leading cause of preventable blindness worldwide.

Filmed in September 2024, this episode highlights the socioeconomic and medical challenges surrounding cataract blindness and introduces viewers to new advancements in surgical training technology that empower healthcare professionals to deliver surgical solutions to underserved communities.

The program is distributed via a third party to Public Television stations in all 50 states.

Preventable cataract-related visual impairment and blindness affect over 100 million people worldwide, creating a significant socioeconomic burden, as low-income populations often lack access to necessary surgical care. HelpMeSee is leading the way with realistic, simulation-based training that equips surgeons and healthcare workers to safely and effectively perform manual small incision cataract surgery, helping to expand access to transformative cataract surgery for those in greatest need.

According to Bonnie An Henderson, MD, president and CEO of HelpMeSee, the need for cataract surgical treatment is urgent.

“Vision loss due to cataract is far more than a medical issue; it is a socioeconomic crisis that disproportionately affects women,” Dr. Henderson noted. “Often, the family member suffering from cataract is confined to the home, which frequently forces the youngest female in the family to give up work or education to provide care.”

Socioeconomic Impact of Cataract Blindness

: An exploration of how cataract blindness disproportionately affects low-income populations and women, limiting their ability to work and contribute to their communities.

Advancements in Simulation-based Surgical Training

: A close look at how innovative HelpMeSee simulation-based training technology is training healthcare providers, making it possible to deliver high-quality surgical care to previously underserved areas.

: Insight into how accessible and affordable eye care can help alleviate global blindness rates and contribute to socioeconomic development.

 and HelpMeSee seek to inspire action and innovation, encouraging viewers to support solutions that make quality eye care more equitable and reduce preventable blindness worldwide. The episode will be distributed once completed and will be available nationwide.

Ryan is known for her roles as quirky, charismatic characters in such films as 

, and many others. She earned a Golden Globe nomination for her role in 

. After a break from films, she returned to the big screen in 2023 in the romantic comedy 

1. FAQ. Empowered Program Hosted by Meg Ryan. Published March 27, 2024. Accessed November 13, 2024. https://www.empoweredprogram.com/faq/

HelpMeSee has partnered with the educational series Empowered, hosted by Meg Ryan, to address cataract blindness, a major cause of preventable blindness globally. The episode, filmed in September 2024, explores the socioeconomic and medical challenges of cataract blindness and showcases advancements in simulation-based surgical training. This training empowers healthcare professionals to provide cataract surgery in underserved communities. The program aims to inspire action towards equitable eye care access and will be distributed to Public Television stations across the United States, highlighting the urgent need for cataract surgical treatment.

HelpMeSee has partnered with Empowered, an educational series hosted by Meg Ryan, to spotlight the cataract blindness crisis, its socioeconomic impacts, and gender inequality issues. The episode emphasizes simulation-based surgical training advancements, expanding cataract care access for underserved populations and fostering equitable healthcare solutions.

Nathan Radcliffe, MD

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