Thursday, December 13, 2012

Could Lasik surgery give you clear vision under water?

Q. If you swim under water with no air space in front of your eyes your cornea cannot properly focus the light because of the large difference in the index of refraction between water and air.

Is the difference in the index of refraction between the cornea and water large enough that Lasik surgery could provide clear vision?
Such a modification would result in blurry vision out of the water, but assume for the purpose of the question that out-of-water vision is not required.

A. no you need a n air space between your eyes and the water to see clearly and if they could you would not be able to focus out of water


What happens when you leave your contacts in for too long?
Q. My friend has left them in for over a week. she sometimes took them out to wash them but that's about it. Soft contacts; picture please?

A. Your corneal stroma begins to fill up with water and you start seeing your vision going hazy. Its best to take out all contact lenses every night except for once in a while when you are out partying or you go camping or something. Your eye needs to breathe to be healthy. Last thing you want is corneal neovascularization (new blood vessels in your eye) which do not go away and can make you not be a candidate for laser eye surgery (LASIK). If it gets REALLY bad you might need to get a corneal transplant but that is quite rare.

Also yes, you are more prone to eye infections and corneal ulcers, so yea just take them out :)


What are some things invented specifically for space missions?
Q. Like Velcro and Tang?

A. Velcro, Tang, Teflon (non-stick surfaces), space suits, cranes, propulsion systems, etc.

Many propulsion systems have been invented specifically for certain missions, and then have later been used for other purposes.

A lot of head way in chemical mixtures has been made since the space program was created, since they experimented a lot for rocket propulsion systems.

Here is a list I found:
-Water Reclamation
-Water/Air purification
-climate monitering
-Global positioning systems
-heart pump
-Lasik eye surgery
-Various vaccines
-high tech jobs
-new industries (hence future space exploration)


Can my eyes be harmed by UV rays even if I'm not in the sun?
Q. I just had LASIK eye surgery done, and I'm supposed to wear 100% UV blocking sunglasses when outside. What about if I'm standing in the shade or looking out the window?

A. Yes, your eyes can be harmed even if you're not in the sun.

Light reflects off of many surfaces - sand, snow, and water tends to reflect the most. Even if you are in the shade or outside wearing a hat, UV radiation can reflect off a lower surface and into your eyes. That's why sunglasses should, in my opinion, always be worn while outside.

Most windows and car windshields have SOME protection against UV radiation, so the sunglasses aren't as important in those situations.

Enjoy not having to wear glasses....now you can get a nice pair of sunglasses :)





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Title Post: Could Lasik surgery give you clear vision under water?
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