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Why Do Optometrists Blow Puffs of Air Into Your Eye?

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I’m basically blind without my contacts, so every year I dutifully schlep to the optometrist to get my eyes tested and outfitted for a new prescription. And every year, I dread it—not just because of the pressure to read the tiniest lines without squinting (just me?), but because of the part of the exam where the doctor has me sit in front of a machine and blasts two puffs of air into each eye. Yesterday, I sat through the torturous puffs of air again, and I asked my optometrist: Is this necessary? Can I skip it next time?

Unfortunately for me, this part of the eye exam helps the doctor determine the fluid pressure inside my eyeball, and is therefore totally necessary. High pressure in the eye can cause glaucoma, or vision loss due to damage of the optic nerve. So the doctor asks me to put my chin on the chin rest, stare at a green light, and then uses a machine called a non-contact tonometer to administer two gentle (but totally startling) puffs of air onto the surface of my eye. The machine measures the air that bounces back and then calculates my intraocular pressure. No one likes this part of the test; it was even the subject of an episode of Friends:

There are other ways to test for glaucoma, but many optometrists opt for the air puff test because it’s quick and painless for the patient. So I guess next year, I'll just have to open my eyes up wide and bear it.

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Big Questions
What Is the Difference Between Generic and Name Brand Ibuprofen?
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What is the difference between generic ibuprofen vs. name brands?

Yali Friedman:

I just published a paper that answers this question: Are Generic Drugs Less Safe than their Branded Equivalents?

Here’s the tl;dr version:

Generic drugs are versions of drugs made by companies other than the company which originally developed the drug.

To gain FDA approval, a generic drug must:

  • Contain the same active ingredients as the innovator drug (inactive ingredients may vary)
  • Be identical in strength, dosage form, and route of administration
  • Have the same use indications
  • Be bioequivalent
  • Meet the same batch requirements for identity, strength, purity, and quality
  • Be manufactured under the same strict standards of FDA's good manufacturing practice regulations required for innovator products

I hope you found this answer useful. Feel free to reach out at www.thinkbiotech.com. For more on generic drugs, you can see our resources and whitepapers at Pharmaceutical strategic guidance and whitepapers

This post originally appeared on Quora. Click here to view.

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Big Questions
Do Cats Fart?
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Certain philosophical questions can invade even the most disciplined of minds. Do aliens exist? Can a soul ever be measured? Do cats fart?

While the latter may not have weighed heavily on some of history’s great brains, it’s certainly no less deserving of an answer. And in contrast to existential queries, there’s a pretty definitive response: Yes, they do. We just don’t really hear it.

According to veterinarians who have realized their job sometimes involves answering inane questions about animals passing gas, cats have all the biological hardware necessary for a fart: a gastrointestinal system and an anus. When excess air builds up as a result of gulping breaths or gut bacteria, a pungent cloud will be released from their rear ends. Smell a kitten’s butt sometime and you’ll walk away convinced that cats fart.

The discretion, or lack of audible farts, is probably due to the fact that cats don’t gulp their food like dogs do, leading to less air accumulating in their digestive tract.

So, yes, cats do fart. But they do it with the same grace and stealth they use to approach everything else. Think about that the next time you blame the dog.

Have you got a Big Question you'd like us to answer? If so, let us know by emailing us at bigquestions@mentalfloss.com.

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