Advertisement
Wednesday, Sep 28, 2022
Outlook.com
Outlook.com

Contact Lenses Contribute To Microplastic Pollution

Discarded contact lenses are contributing to the rising micro-plastic pollution in the world’s water bodies and could eventually find their way to the human food supply, scientists including one of Indian origin have found.

Contact Lenses Contribute To Microplastic Pollution
Contact lenses contribute to micro-plastic pollution | Representative Image
Contact Lenses Contribute To Microplastic Pollution
outlookindia.com
2018-08-20T12:26:12+05:30

Lenses, usually discarded after about a month or sometimes just a day's use, often end up in wastewater treatment plants. Researchers concluded that microbes in the wastewater treatment facility actually altered the surface of the contact lenses, weakening the bonds in the plastic polymers.

"When the plastic loses some of its structural strength, it will break down physically. This leads to smaller plastic particles which would ultimately lead to the formation of microplastics," said Varun Kelkar, one of the researchers from Arizona State University (ASU).

Aquatic organisms can mistake microplastics for food and since plastics are indigestible, this dramatically affects the marine animals' digestive system. These animals are part of a long food chain. Some eventually find their way to the human food supply, which could lead to unwanted human exposures to plastic contaminants and pollutants that stick to the surfaces of the plastics.

"We began looking into the US market and conducted a survey of contact lens wearers. We found that 15 to 20 per cent of contact wearers are flushing the lenses down the sink or toilet," said Charlie Rolsky, a PhD student at ASU.

"This is a pretty large number, considering roughly 45 million people in the US alone wear contact lenses," said Rolsky. Contacts tend to be denser than water, which means they sink, and this could ultimately pose a threat to aquatic life, especially bottom feeders that may ingest the contacts, researchers said.

Analysing what happens to these lenses is a challenge for several reasons. First, contact lenses are transparent, which makes them difficult to observe in the complicated milieu of a wastewater treatment plant. Further, the plastics used in contact lenses are different from other plastic waste, such as polypropylene, which can be found in everything from car batteries to textiles.

Contact lenses are instead frequently made with a combination of poly(methylmethacrylate), silicones and fluoropolymers to create a softer material that allows oxygen to pass through the lens to the eye. So, it's unclear how wastewater treatment affects contacts.

These differences make processing contact lenses in wastewater plants a challenge. To help address their fate during treatment, the researchers exposed five polymers found in many manufacturers' contact lenses to anaerobic and aerobic microorganisms present at wastewater treatment plants for varying times and performed Raman spectroscopy to analyse them.

"We found that there were noticeable changes in the bonds of the contact lenses after long-term treatment with the plant's microbes," said Kelkar.

PTI

Advertisement

Outlook Newsletters

Advertisement
Advertisement
Advertisement

Read More from Outlook

Lament Of Separation: Songs Of Habba Khatun, Last Queen Of Kashmir, Still Echo In Valley

Lament Of Separation: Songs Of Habba Khatun, Last Queen Of Kashmir, Still Echo In Valley

In happy times and sad, Habba Khatun’s sensuous songs make both young and old emotional. With the never-ending conflict bringing tragedies to every doorstep, Habba’s lyrics of separation amplify their mourning.

How Indian Laws Govern People’s Right To Love And Live

How Indian Laws Govern People’s Right To Love And Live

In India, only those relationships between a man and a woman are considered to be legitimate when there is a marriage between the two.

Kohli Quits Test Captaincy, Leaves Leadership Vacuum

Kohli Quits Test Captaincy, Leaves Leadership Vacuum

Virat Kohli, 33, had recently stepped down as India's T20I captain and was subsequently removed as the ODI captain.

UP Elections 2022: How Congress Is Harnessing Power Of 'Persecuted' Women To Counter BJP

UP Elections 2022: How Congress Is Harnessing Power Of 'Persecuted' Women To Counter BJP

A Mahila Congress leader, who is the face of the ‘Ladki Hoon, Lad Sakti Hoon’ campaign, however, has accused the party of anti-women bias after she was denied a ticket.

Advertisement