Refraction Tests are eye examinations that are used to measure the ability of the eye to refract or bend light as it passes through the cornea and lens.The test measures the eye's ability to focus on objects at near and far distances.
During the test, the eye doctor will ask the patient to look through a device known as a phoropter.The phoropter contains a series of lenses with different strengths that the doctor will use to determine the power of the patient’s eyes.
The doctor will ask the patient to look through the phoropter at an eye chart and read out certain letters on the chart.Depending on the patient’s response, the doctor will adjust the lenses in the phoropter until the patient can read the letters on the chart correctly.
This process is repeated until the doctor is able to determine the correct power of lenses needed to correct the patient’s vision.