![]() For most people with myopia, eyeglasses are the primary choice for correction. People with myopia have several options available to regain clear distance vision. Once testing is complete, your doctor can discuss treatment options. He or she will also determine the power of any lens correction needed to provide a clearer vision. Using the information from these tests, along with the results of other tests of eye focusing and eye teaming, your doctor can determine if you have myopia. The eye drops temporarily keep the eyes from changing focus during testing. In some cases, such as for patients who can't respond verbally or when some of the eye's focusing power may be hidden, a doctor may use eye drops. Your doctor can conduct this testing without using eye drops to determine how the eyes respond under normal seeing conditions. The power is then refined based on your responses to determine the lenses that allow the clearest vision. ![]() Or the doctor may choose to use an automated instrument that evaluates the focusing power of the eye. Using an instrument called a phoropter, a doctor of optometry places a series of lenses in front of your eyes and measures how they focus light using a handheld lighted instrument called a retinoscope. ![]() Normal distance visual acuity is 20/20, although many people have 20/15 (better) vision. A person with 20/40 visual acuity would have to get within 20 feet to identify a letter that could be seen clearly at 40 feet in a "normal" eye. The bottom number is the smallest letter size read. The top number of the fraction is the standard distance at which testing is performed (20 feet). This test measures visual acuity, which is written as a fraction, such as 20/40. As part of the testing, you will identify letters on a distance chart. Testing for myopia may use several procedures to measure how the eyes focus light and to determine the power of any optical lenses needed to correct the reduced vision. However, myopia may also develop in adults due to visual stress or health conditions such as diabetes. Because the eye continues to grow during childhood, it typically progresses until about age 20. Generally, myopia first occurs in school-age children. People with myopia can have difficulty clearly seeing a movie or TV screen, a whiteboard in school or while driving.
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