Refraction is to check the concentration of light after it enters the eyeball. It measures the difference of convergence and divergence between the examined eye and the emmetropia based on the state of emmetropia. There are many methods of optometry. Insertion optometry is a common one in clinic, which mainly checks the refractive state of patients to see if they have myopia, hyperopia and astigmatism.
It is to add and subtract lenses in front of patients and determine the most suitable lens to correct ametropia according to the progress of vision. If children or teenagers can't correct their eyesight with various lenses, mydriatic optometry should be used to eliminate amblyopia. There are also some optometry methods, such as crossed cylindrical astigmatism corrector, astigmatism table optometry, pinhole and fissure film inspection, etc.
If the patient has blurred vision, he needs to go to the hospital for regular medical optometry. There are essential differences between medical optometry and optometrist optometry. Because optometrists have no medical qualification, they can only do routine optometry. The purpose is only to let ametropia patients see the object clearly, and the examination method and optometry equipment are relatively simple. Hospital optometry is medical optometry, which is relatively complicated and requires higher optometrists and optometry equipment.
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