The construction of eyeglasses

Apart from the accuracy of the prescription, the glasses that the child will eventually wear also play an important role (ie the frame and lenses).

The frame of the glasses should be appropriate for the face of the child, not only aesthetically but also functionally. During the selection of the frame the size of the root of the child’s nose should be taken, so the glasses won’t be slippery and the bottom of the frame should not be touching the child’s cheeks.

The lenses of children's glasses are generally made ​​of plastic, to withstand more, and are lighter making the glasses more tolerable for the child.
The refractive power of the glasses’ lens is not exactly the same across the surface. The prescribed strength of the lens is located at the center, ie the location of the lens just in front of the pupil.

Because the thickness (and hence power) of a myopic lens increases with distance from its "center" (biconcave lens), patients with myopia that has grown compared to the last recipe, slightly lift their glasses to look from a stronger point of the lens.

The distance between the centers of the glasses is determined by the interpupillary distance of the child. This measurement is not normally made by the doctor and is not listed in the recipe, although the recipe often has a suitable venue. This distance is measured by the optical using a special meter, before proceeding with the construction of the glasses.