The optometrists will then assess whether or not visual correction in the form of spectacles or contact lenses is required. The first part of this process is the use of a retinoscope, a handheld device used by the optometrist allowing an accurate approximation of the level of myopia (short sightedness), hyperopia (long sightedness and astigmatism (rugby ball shaped cornea) and therefore an approximation of the required spectacle prescription. This process takes only a few seconds to perform, and involves the optometrist shining a light into the eye.

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