Children with eye axes longer than 24mm do not necessarily have true myopia, and children need to undergo an optometric examination to clarify whether they have myopia.
Children’s eye axis develops at the age of 18 years, and the normal eye axis length is around 23.5 to 24mm. If the axial length of the eye exceeds 24mm, and the corneal curvature is in the normal range of 43D, the possibility of myopia is higher. However, it is generally impossible to determine the refractive status of the examinee’s eye if only the eye axis length is looked at and no attention is paid to the corneal curvature.
Curvature is an expression of the curvature of the cornea, and 1D of curvature is equal to about 100 degrees of refraction. While 1mm of eye length is about 200 to 300 diopters of refraction. For every 2D decrease in corneal curvature, the standard axial length of the corresponding orthokeratology eye can be increased by about 1mm. if you want to make it obvious that a child is suffering from true myopia, a dilated optometric examination is required.
It is recommended that children with abnormal eye axes be seen for evaluation of the condition and treatment and care as prescribed by the physician.