An 8 year old child with 500 diopters of myopia will need to undergo a dilated optometric examination to determine whether the myopia is true or pseudomyopia. True myopia needs to be corrected by wearing glasses, while pseudomyopia needs to be alleviated by doing adjustment function training and developing good eye habits. Myopia is a common ophthalmologic disease, belonging to one of the most common types of refractive error. It usually develops in childhood, causing children to have the symptom of blurred vision of distant objects, and requires timely intervention, which should be preceded by a dilated optometric examination to clarify whether it is true myopia or pseudomyopia. For true myopia, glasses are needed to correct the problem, and if the child does not want to wear glasses as an adult, laser surgery can be considered. For pseudomyopia, glasses are not necessary. The occurrence of pseudomyopia is usually related to the loss of eye adjustment function, which can be restored by doing adjustment function training, and at the same time, attention should be paid to the protection of the eyes to avoid visual fatigue. It is recommended that patients go to the ophthalmology department of the hospital in a timely manner, and the doctor will formulate a plan after a comprehensive examination.