6 ms·
The absolute miniscule volume
by theMMaI 10mo ago
The absolute miniscule volume
- wagwang 10mo agoPfas are measured in ppb or even ppt
- terminalshort 10mo agoAnd water supply is measured in km^3
- wagwang 10mo agoso 1 liter of eye drop per 1ppt of km^3
- terminalshort 10mo agoThat would be 1 liter of the active ingredient, not 1 liter of the eye drop. Also I don't believe that 1 ppt of this stuff is harmful when people are putting it directly in their eyes without severe harm.
- OutOfHere 10mo agoIt's most definitely going to accumulate inside the body, although slowly.
- terminalshort 10mo agoYes, but too slowly to matter. Average person consumes 1.5 liters per day of water, so if you live to 100 that's 55000 liters. At 1 ppt that's 1 ng / liter, or 55 ug over a lifetime. That's multiple orders of magnitude less than one drop of the stuff to your eye.
- OutOfHere 10mo agoWe will know after the drops have been out for over a decade, and actual real-world safety data studies get published. Meanwhile, Restasis (cyclosporine A) (or a generic) works well, and doesn't have to be applied all day long, just two or three times a day. It does burn the eye initially, but it's not harmful, and the burning goes slowly away over time. It does take a few months to start working.
- jaggederest 10mo agoThere's only a single ingredient, these eyedrops are 100% pure PFAS And people put asbestos on their christmas trees back in the day - I don't think "obvious harm" is a high enough standard.
- terminalshort 10mo agoI think obvious harm at 1 trillion parts per trillion is a pretty good standard to meet if you want to claim harm at 1 part per trillion.
- wagwang 10mo agoMaybe, maybe not, maybe like teflon, the real poison is an intermediate ingredient, but I think its bullshit that we're just creating chemicals that linger in our water supply for eternity. You literally cannot find anyone in America without traces of the dangerous variant of the PFAS in their blood stream. Like every sip of water is some ridiculous dupont cocktail and we have to tolerate it because people have dry eyes and want non stick pans. Why cant you just use theratears?
- cyberax 10mo ago> You literally cannot find anyone in America without traces of the dangerous variant of the PFAS in their blood stream. You also can't find anybody in the world without traces of lead, arsenic, uranium, radium, and other chemical elements in their blood. > Why cant you just use theratears? Because they don't work.
- daedrdev 10mo agoGood thing there are 3*10^21 atoms of H2O in a water drop
- autoexec 10mo agoHow many gallons of Miebo/Evotears do you think are manufactured every year?
- dotancohen 10mo agoMultiply that by the t in ppt. How many trillions of gallons of water do you think an average city uses every year?
- andy99 10mo agoIs all the Miebo/Evotears that’s manufactured being dumped directly into the drinking water supply?
- wagwang 10mo agoHow do you think pfas got into the water supply in the first place.
- jaggederest 10mo agoLargely firefighting foams, industrial and manufacturing, and landfill sources, but it's still an interesting problem. They don't really break down (that's why they're so useful both in a materials science sense and as a medication) which implies they'll stick around for an extremely long time.
- dotancohen 10mo agoWhere do you think it goes after it gets to your eyes? The valid choices are: A. Absorbed into your body forever. B. Becomes a part of the water cycle. C. Is broken down. And even choice A eventually becomes choice B, ideally after significant time though.
- autoexec 10mo agoOne thing you can be sure of is that the vats of PFAS being produced year after year for this drug aren't going away anytime soon. They're called "forever chemicals" for a reason.