Why do I need to dilate my pupils for a vision test?

Dilated pupil optometry, in fact, the medical terminology is called "ciliary muscle paralysis optometry". It means that the patient is given ciliary muscle paralysis eye drops to relax the patient's eye adjustments before the eye test, and then retinal imaging or computerized optometry is performed.

The purpose of dilated optometry is not to "dilate the pupil" (this phenomenon is only an appearance in the process), but to fully paralyze the ciliary muscle in the eye through the drug, eliminating the regulation caused by the contraction of the ciliary muscle, and eliminating the effect of over-adjustment on the results of the optometric test, so as to accurately determine the nature and degree of the true refractive state of the eye, and to obtain correct and reliable results. The result is to accurately determine the nature and extent of the true refractive state of the eye and to obtain correct and reliable results.

Epidemiologic surveys show that the lower the age, the higher the incidence and severity of ocular functional accommodation spasms. This is why it is important to perform a dilated eye examination for children undergoing their first refraction. The refractive state of the eye may become normal in patients with low myopia who have not had their eyes dilated. This part of the myopia is actually pseudomyopia - a temporary, reversible form of myopia.