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Vision testing refraction

Vision testing refraction test; a major tool for determining the correct power of the lenses
The vision testing refraction test is one of those eye examination methods which is helpful in the measurement of person’s direction for the use of contact lens and eye glasses. This test can be performed with ease as a part of the daily routine checkup and it is recommended to get this checkup once in a year. 
The main motive of this examination is to check if any refractive error is present in the vision. This might prove helpful in the determination of major eye problems like glaucoma. People with the glaucoma disease history should get the eye checkup done once in a year for sure. The refraction test is mainly performed to detect problems like astigmatism, myopia, presbyopia, hypermetropia, corneal ulcers, retinal detachment, macular degeneration and retinal blockage or retinitis pigmentosa. 
The refraction test is usually performed by the optometrist or ophthalmologist who makes the patient sit on the special chair that is attached with a refractor. Then the doctor asks the patient to look via that device and then focus on the eye chart about 20 feet apart. This particular device has some inbuilt lenses of different powers that can be rotated or moved for viewing. It is performed for one eye at a time and the doctor views that particular chart to determine any refractive error in the eyes.
This test is one of the major tools for the determination of the correct power for the reading glasses.