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In older children and adults, the most common way to prescribe glasses is to try different lenses in front of their eyes, asking them in every case, with which lens they see better.
In older children and adults, the most common way to prescribe glasses is to try different lenses in front of their eyes, asking them in every case, with which lens they see better.
This can be done either by using lenses that are placed in a test spectacle frame or by special machines with integrated lenses, called phoropters.
Nowadays, in everyday clinical practices, computing machines are used, which can calculate with sufficient accuracy a patient’s refraction within a few seconds.
These machines are called refractometers and are now in all modern eye clinics. Though always, the recipe that follows is confirmed or modified by testing lenses in front of the patient and expecting him to respond to what lens he sees best.