Simple myopia in children For infants and young children, myopia below 3.00D usually does not require correction. Myopia below 3.00D in infants is sometimes eliminated within 2 years of age. Myopia in preterm infants may also decline in childhood, with 50% reaching orthopia by age 7. Also, the infant’s range of motion is within close proximity to his teaching, so correction is not very necessary. For preschoolers with more distance visual function requirements 1.00-2.00D myopia can be considered corrected with negative lenses. If the preschooler’s myopia is not optically corrected, a follow-up visit is required every six months. Correction is generally required for myopia above 3.00D, or if the child exhibits some undesirable behavior due to the inability to see clearly at intermediate and long distances, such as tilting the head and squinting, blinking, etc. As the grade level increases, the requirements for children’s middle and distance visual function continue to increase. Myopia greater than 1.00D or naked eye acuity less than 0.5 is generally used in the lower grades for visual function screening as the basis for further examination at the clinic. For optometrists one or both of these criteria may also be used as a basis for whether myopia requires correction. Adolescents and adults with simple myopia For adolescents and adults, optometrists generally prefer to correct clearly present myopia, usually 1.00D or higher. However, if precise and high-resolution distance vision function is required, low degrees of myopia also need correction. The requirements for distance visual function vary depending on the patient’s occupation, education level and recreational sports habits. Generally, patients whose distance visual function is not meeting their needs due to the presence of myopia will need correction. For example, with -0.75D myopia, the daytime naked eye vision is around 0.8, and the patient works in an office during the day and does not need correction. However, when driving at night, the uncorrected state severely affects driving and requires the use of optical correction tools while driving at night. The 95% limit of agreement for repeatability of subjective optometry is about 0.5D, so a change in prescription is generally required when there is a 0.5D change from the current prescription for lens wear. It is important to consider both the patient’s convergence and dispersion and accommodation when correcting myopia. The patient’s dispersion and accommodation will be affected by the internal wear. For patients with high emmetropia, moderate AC/A, and normal adjustment function, a full day wear of myopic lenses with adequate correction is recommended; while for non presbyopic patients with under-adjustment and over-agglomeration, a far near-point ortho-optic addition to the far correction will be recommended, which can be achieved with bifocal lenses or gradient multifocal lenses. Myopic astigmatism If myopia is combined with the presence of myopic astigmatism, generally astigmatism above 0.5D needs to be corrected. However, if the patient has previously successfully corrected 0.25D astigmatism, then this should be added to the new prescription. Likewise, the patient’s occupation, education level, and recreational sports habits should be considered. Pseudomyopia The goal of treatment is to relax the patient’s regulation. The use of lens prescriptions obtained from subjective optometry throughout the day is not recommended because it is not conducive to relaxing the patient’s adjustments. Some methods of relaxation of the regulation can be used: visual therapy; ciliary muscle paralyzing medication on the spot; ortho-additive lenses at the near point; health promotion, etc.