Improving general eye knowledge is a necessity for today's life.
This issue briefly discusses refractive errors of the eye.
Generally, the most common known refractive errors are:
Hyperopia
Myopia
Astigmatism
Presbyopia
Hyperopia: In the hyperopia type of refractive error, referring to the previous material on the functioning of the optical system of the eye, the focal length of the eye is longer than its axial length, causing the formation of unclear images on the retina, which will result in blurred vision, especially at close distances.
This refractive error of the eye is corrected using glasses that use converging lenses. Of course, the power of the prescribed corrective lens is directly related to the degree of hyperopia (increasing the focal length of the eye). Therefore, the proportion of the degree of hyperopia in different people with corrective lenses can lead to receiving glasses with thick or thin lenses, which should also be considered when choosing glasses.
If people develop hyperopia in childhood due to being in the growing age, if their refractive error is not diagnosed in time, there is a possibility of developing other disorders such as amblyopia, deviation, or double vision. Therefore, even if there is no problem with the appearance of their eyes, children are required to have periodic checks from the age of three, which is the best recommendation to avoid the aforementioned disorders.
In addition, "at any age during the growth period, changes occur in the number of eyes, which continue to require periodic checks until the age of 21 for accurate and permanent control.
It is also necessary to point out that the prescribed prescription alone does not have a complete effect in correcting this visual disorder, because the type of lens selected, which is generally found in eyeglass stores, can have a significant effect in eliminating these visual disorders. Also, observing other principles in making glasses is of particular importance and should not be overlooked.
Therefore, when purchasing glasses, sufficient information about the available facilities can lead people to the desired result.
The Jahanban Optics Group Consulting Unit will answer your questions at www.jahanbangroup.ir
Mahmoud Jahanban
