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In the previous chapter we saw how visual acuity using eye charts and other methods is measured. But how does the oculist determine the nature and strength of the lenses to be prescribed to the child in order to achieve maximum visual acuity?
Although the natural "diffraction" is the phenomenon of diversion of the straight path propagation, which suffers bright or other waves when passing through a permeable medium to another, we use the same term for the process of granting glasses in ophthalmology.
Refraction in older children
In older children and adults, the most common way to prescribe glasses is to try different lenses in front of their eyes, asking them in every case, with...
Refraction in younger children
Although the methods mentioned in the previous paragraph can lead to excellent results in adults or older children, unfortunately this is not the case...
The use of eyedrops on children’s refraction
In order for the refraction to be performed correctly and the eyeglasses prescription to be accurate, before starting the process the temporary paralysis...
The degrees of refractive abnormality
Myopia, hyperopia and astigmatism, as well as the lenses used to correct them, are measured in diopters.
The prescription of eyeglasses
Every eyeglass prescription is consisted of numbers describing the refractive abnormality for each eye separately.
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 child and contact lenses
Contact lenses are a precious creation of technology, which solves some of the problems of glasses, such as cosmetic reasons and practicality.
Correction of refractive abnormalities with Laser
In recent years the use of special ray Laser (excimer Laser) brought new possibilities for the treatment of refractive abnormalities, with permanent results.