Sunday, July 21, 2013

lazik eye surgerey? i was wondering more about how its done and stuff

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Q. i was wondering more about the lazik eye surgerey....my dad plans on getting in a couple days.....its supposed to have the life time guarente...of course there is natural eye ageing but if anything ever goes wrong with the part they fix they say they will fix it for free?...i was wondering if it hurts? or are any side effects for a couple of days after...a couple of his friends have had it and they all love it....thanks for the feedback


Answer
I just had Lasik 9 days ago. What they do is they take 3D pictures of your eyes so they can know exactly how to make the shape of your eye normal so you will have good vision. Then they set the laser how to change the shape of your eye. When you have the operation, they put drops in your eyes so you don't feel anything. They get you on the operating table and put some metal in the eye to keep it open. It's not comfortable but it doesn't hurt. Then they have a machine that touches the eye and suctions it so it doesn't move. Again, doesn't hurt. They cut a flap from the cornea, fold it up and then change the shape of your eye with the laser. You can smell the eye burning, smells a bit like burning hair. Then they put the flap of the cornea back down and do the other eye and then they give you sunglasses to wear to protect your eyes.

When you get home and the drops start to wear off so you start to feel your eyes again, they will really hurt for a few hours. After that they are fine. You are supposed to wear the dark sunglasses for 24 hrs. inside the house and out and there are a lot of eyedrops to use all the time. After 24 hrs. the sunglasses should still be worn outside for a week, even when it's dark out because they will protect the eyes from wind and dust. It's ok to go back to work or school after a couple of days, maybe a week if you work in a dusty place but the vision can be blurry for a couple of weeks after the surgery because the eyes are still healing.

Write a note about application of laser?




sweety





Answer
It was once said by Sir Townes, who is credited with inventing the first working ruby Laser, that the laser is a remarkable device looking for an application. That was in 1968. Today, there are numerous applications for lasers.

Lasers are used in medicine: for eye surgery, eye treatments and corrections to the cornea, in major surgeries ultrafst lasers are used because theyt have very short pulses with high peak power, which means they will cut the spots they are focused on while not affecting the areas around the focused spot (i.e., very little or no heat damage to surrounding tissue). THe same principle is why we use lasers in eye surgery. Also, different tissue absorbs different wavelengths of light, so specific wavelengths of lasers may be developed to be absorbed by specific types of tissue, like cancerous tissue, for example. Cancerous breast tissue absorbs longer wavelengths of light than normal breast tissue, so if one spots a long wavelength (inra-red) laser beam on the breast, it only affects the cancerous issue, as it passes right through the normal tissue and doesn't affect it. When tissue is heated, enough, it will die. Hence cancer therapy with lasers.

Lasers are used in industry for materials processing (welding, cutting, drilling). The advantage of using lasers in this area are that the cuts are very clean (or holes, or welds) and the laser can be attached to robotics that are automated to perform repetitive cuts very quickly. Laser pulses from pulse to pulse are quite stable, when properly designed, so the repeatability in manufacturing applications is tremendous, far better than mechanical cutting, drilling, and traditional MIG or TIG welding.

Laers are used for imaging. The wavelength of lasers ranges from the deep UV (~200 nm) to the far infra-red (~10 um). The shorter wavelengths of light act of small cameras when refelcted back from a sample, for example of human biological tissue or even molecules themselves. So the laser can be a very high resolution imaging "camera".

Lasers are used in rapid prototyping for developing 3D models of products very quickly, they are used in disk drive manufacture to create "landing pads" on the disk drives for the disks to remain stable when being written to or read from, and are used in the interest of national security (i.e., weapons systems). Lasers can be used as sensors, even very long range remote sensors (LIDAR), as motion detection devices, and as pure research tools.

There are more, but that gives you an idea.




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