Due to the current situation in China, ophthalmologists emphasize that myopic patients must opt for medical optometry and, if necessary, dilated pupils. The pupil dilatation, as the name implies, is actually the use of some kind of ciliary muscle paralyzing agent to paralyze the ciliary muscle of the eye, leaving the eye in a state of unadjusted rest, which is called pupil dilatation because it also dilates the pupil. This is called dilatation because it causes the pupil to dilate at the same time. When the eye’s regulation is eliminated, the optometry results are more realistic and reliable, so that pseudomyopia and spasm of regulation are not misdiagnosed as myopia. Because dilating agents relax the eyes and provide rest, they can be used as preventive and therapeutic medication for myopia, and because the dose is small and has no systemic effects, there are no side effects. So, when do I need to have a dilated eye exam? First of all, for children and adolescents under the age of 18 who are first-time optometrists, pupil dilatation is necessary in cases where there are no contraindications due to their generally strong adjusting power and the tendency to strain the eye muscles during long-term close eye use. Secondly, for those with hyperopia and strabismic amblyopia, pupil dilatation is necessary due to the presence of occult hyperopia. In addition, patients with cloudy refractive media and patients with eyestrain who are uncomfortable wearing glasses and cannot identify the cause should have their pupils dilated when necessary. What’s more, for patients who cannot cooperate with the optometrist in subjective optometry for various reasons, dilated pupil optometry is the only effective and reliable way of optometry. Warm tip: Dilated optometry has a unique importance and necessity. We should follow the advice of our doctors and optometrists when choosing an optometry method and make an accurate choice.