No, but you'll need to have corrective lenses that allow you to pass an eye test during the medical examination that is necessary to receive a pilot's certificate (in the U.S.).
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An airforce pilot needs to have good vision and be able to withstand extreme amounts of physical and emotional stress. They also need to have previous pilot experience and be a good pilot.
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Yes you five year old should, because if he/she doesn't, his/her eyes will not be healthy when they grow up.
20/40 or better in each eye separately, with or without correction. Color vision as needed to safely perform airman duties.
No. It has absolutely no effect on vision. Genetic factors affect vision. Also, straining your eyes (i.e reading in dim lighting) will cause your eyes to work harder than they need to, thus worsening your vision.
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The actual size of a lion's eyes is unclear, however, they are larger than human eyes. A lion's eyes have long-distance vision which they need for hunting prey.
Some jobs are not open to people with certain vision problems. Especially positions such as pilot, where excellent vision is required.
Stress can affect your eyes/vision in a number of ways. If stress is keeping you from getting enough sleep, it can cause your eyes to feel dry and blurry. Also, stress can raise your blood pressure, which will also affect your eyes/vision. Stress is also one of the major causes of headaches, which affect your eyes/vision, as well. You need to see your physician or your optometrist to make sure there is nothing else going on with your eyes, though.
Civilian Pilot: It needs to be Correctable to 20-20 to be a civilian pilot. So you can wear glasses and fly. Military: You need to have 20-20 vision uncorrected to be a pilotso you would have to get laser eye surgery to be a military pilot, however other military employments in an airborn craft maynot need glasses. Such as a navigator. Answer two: It depends on your country of origin mostly. Here in Canada you need: Civilian: 20/30 corrected/uncorrected. Military: 20/20 corrected. Since last year, glasses are now allowed. Laser eye is still not and according to my local recruiter, probably never will be.
The eyedoctor's goal is to have both of your eyes clear. He will most likely say you still need glasses.