The Farnsworth Lantern Test is a test of color vision. Test takers must identify the colors of two lights that may be any combination of red, green or white.Continue Reading
Test takers view a series of nine color combinations. These color combinations may be two different colors or two of the same color. To pass the test, applicants must correctly identify at least eight out of the nine color combinations. The colors are only shown for two seconds, as it is possible for those without color vision to eventually discern the difference from luminance cues. The test is designed so that those with mild color-vision deficiency can still pass it.
The test is commonly abbreviated as FALANT and is used by the U.S. military for color-vision testing. FAA authorization is not required to take this test, so it is usually the first option employed in flight testing. Military test-takers who pass the exam do not have a color or night-flying restriction. Those that do not pass the exam have the option of taking a color signal light test, operational color vision test or a color vision medical flight test as alternative evidence of color vision. These tests may require authorization from the FAA.Learn more about Vision
The first noticeable symptoms of macular degeneration are often wavy lines, followed by vision distortion and differences in color perception, according to WebMD. Other symptoms include distorted central vision, blurry white or dark patches, and difficulty seeing details and objects in the distance.Full Answer >
Symptoms of optic nerve disorders include pain behind the eyeball that is exacerbated by eye movement, flashing lights, and loss of vision and color vision, states Mayo Clinic. The loss of regular vision is made worse by taking a hot bath or exercise, and colors appear less intense than usual. Other symptoms are blind spots and blurring and distorted vision, according to All About Vision.Full Answer >
A vision, or visual, field test is a type of diagnostic test that measureﾒs the entire scope of a personﾒs vision, including both side, or peripheral, and central vision, according to MedicineNet. Optometrists generally order a vision field test to check for damage to the optic nerve due to glaucoma.Full Answer >
A driver's license eye test or vision screening is necessary to determine whether an individual who is applying for or renewing a driver's license meets the vision standards required for safe driving. It is also the basis for determining the type of driver's license issued to a driver.Full Answer >