Subjective refraction, or simply refraction, is one of the most common tests performed daily in an ophthalmology office. With the help of crystals with different strengths, we are able to obtain the exact graduation of the patient. In this way, it is possible to know if the patient has a refractive defect such as myopia, hyperopia or astigmatism. It also helps us to establish the progression of any of these pathologies and thus be able to treat them in the best way. In addition, it can alert us to the appearance of other pathologies in incipient states such as cataracts, presbyopia, glaucoma, etc.
Graduation is complemented by other types of more specific tests, among which are, for example, the measurement of the patient's contrast sensitivity, their degree of depth perception or their ability to distinguish colors. The latter is especially important to assess whether there is possible color blindness.
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