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What is an instrument called the microkeratome used for in corneal surgery?
GaleEncyofSurgery
The surgeon creates a flap of tissue across the cornea with an instrument called a microkeratome, ablates the cornea for about 30 seconds, and then replaces the flap.
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∙ 13y ago
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What instrument measures triangles?
The instrument for measuring the angles of a triangle is called a protractor.
What intrument is used to measure an angle?
The instrument used to measure a angle is called a protractor!
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What would you advise to someone who is going to take LASIK surgery based on your actual experience?
During SurgeryThe surgery should take less than 30 minutes. You will lie on your back in a reclining chair in an exam room containing the laser system. The laser system includes a large machine with a microscope attached to it and a computer screen. (See the animation of the LASIK procedure.) A numbing drop will be placed in your eye, the area around your eye will be cleaned, and an instrument called a lid speculum will be used to hold your eyelids open. Your doctor may use a mechanical microkeratome (a blade device) to cut a flap in the cornea. If a mechanical microkeratome is used, a ring will be placed on your eye and very high pressures will be applied to create suction to the cornea. Your vision will dim while the suction ring is on and you may feel the pressure and experience some discomfort during this part of the procedure. The microkeratome, a cutting instrument, is attached to the suction ring. Your doctor will use the blade of the microkeratome to cut a flap in your cornea. Microkeratome blades are meant to be used only once and then thrown out. The microkeratome and the suction ring are then removed. Your doctor may use a laser keratome (a laser device), instead of a mechanical microkeratome, to cut a flap on the cornea. If a laser keratome is used, the cornea is flattened with a clear plastic plate. Your vision will dim and you may feel the pressure and experience some discomfort during this part of the procedure. Laser energy is focused inside the cornea tissue, creating thousands of small bubbles of gas and water that expand and connect to separate the tissue underneath the cornea surface, creating a flap. The plate is then removed. You will be able to see, but you will experience fluctuating degrees of blurred vision during the rest of the procedure. The doctor will then lift the flap and fold it back on its hinge, and dry the exposed tissue. The laser will be positioned over your eye and you will be asked to stare at a light. This is not the laser used to remove tissue from the cornea. This light is to help you keep your eye fixed on one spot once the laser comes on. NOTE: If you cannot stare at a fixed object for at least 60 seconds, you may not be a good candidate for this surgery. When your eye is in the correct position, your doctor will start the laser. At this point in the surgery, you may become aware of new sounds and smells. The pulse of the laser makes a ticking sound. As the laser removes corneal tissue, some people have reported a smell similar to burning hair. A computer controls the amount of laser energy delivered to your eye. Before the start of surgery, your doctor will have programmed the computer to vaporize a particular amount of tissue based on the measurements taken at your initial evaluation. After the pulses of laser energy vaporize the corneal tissue, the flap is put back into position. A shield should be placed over your eye at the end of the procedure as protection, since no stitches are used to hold the flap in place. It is important for you to wear this shield to prevent you from rubbing your eye and putting pressure on your eye while you sleep, and to protect your eye from accidentally being hit or poked until the flap has healed.What should I expect before, during, and after surgery?http://www.fda.gov/cdrh/lasik/expect.htm
Can you correct astigmatsim without glasses contact lenses or surgery?
There is an eye therapy that you can see an optometrist for called Corneal Refractive Therapy. You would sleep at night in a hard contact lens that reshapes your corneas while you sleep. In the morning you take the contacts off and you can see temporarily, depending on your prescription from a couple days to a couple weeks. The therapy is expensive but is a definite alternative to surgery.
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