Your eye doctor can diagnose myopia as part of a comprehensive eye examination. He or she will determine if you have myopia by using a standard vision test, where you are asked to read letters on a chart placed at the other end of the room.
If the vision test shows that you are nearsighted, your doctor will use certain examination devices to learn what is causing the myopia. By shining a special light into your eyes, a retinoscope will be used to see how light reflects off your retina. As the light is reflected back from inside the eye, it can indicate whether a person is nearsighted or farsighted.
Your doctor will also use a phoropter, an instrument that the measures the amount of refractive error you have and helps determine the proper prescription to correct it.
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