A trial frame is used to find the best lens for a patient with a refraction problem. Short sight or long sight are among the most common visual probl
A trial frame is used to find the best lens for a patient with a refraction problem. Short sight or long sight are among the most common visual problems, with the latter increasing with age. A regular eye exam, including tests with the trial frame, is essential to ensure glasses or contact lenses are giving the best possible correction of the problem.
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