Most often performed as part of a routine eye examination, an eye refraction test gives an eye doctor a precise diagnosis regarding your prescription glasses or contact lenses. If you suffer from bad eyesight, whether from astigmatism, farsightedness, or nearsightedness, you’ll need an eye refraction exam to determine the right refractive correction you require. There are many different types of refractive correction available to patients, and knowing your options is the first step to choosing which refractive correction will best meet your needs.
This exam’s primary goal is to confirm your optical prescription, which is determined by a series of visual tests performed by an ophthalmologist. An FSN refraction eye exam will look at three things: the curvature of your cornea, the size and shape of your iris, and the thickness of the retina. All three of these factors will affect the quality and scope of your vision. An eye exam can also evaluate if you require glasses or contacts for correcting your vision.
The most common test used to diagnose eye problems is called the corneal curvature test. The exam measures the distance from the center of the cornea to your retina by looking at a series of slides and charts. The test measures the degree to which your cornea is curved by the slide or chart and then compares it to a chart that shows the same curve on a computer screen. The eye doctor can tell the condition of your eyesight, depending on whether your cornea appears too curved or too thick.
It’s generally recommended that you get this type of exam from an ophthalmologist’s office. However, some eye specialists offer this procedure in their offices on their own, and some optometrists offer the service free of charge. In general, the procedure is done on an outpatient basis and typically doesn’t take more than an hour.
Another thing that’s measured during the FSN refraction eye exam is the extent of your vision loss. If you’ve had eye injuries that required surgery or other corrective measures, your vision will be tested in order to find out what kind of glasses or contacts you require. Sometimes the extent of your vision loss will cause your optometrist to recommend either glasses or contacts.
While an eye refraction test might sound scary, it’s worth understanding that it doesn’t involve any pain. You should also ask your optometrist about how often you should undergo this exam to guarantee that your vision won’t get any worse.