What is Hyperopia Reserve?
It refers to that the optic axis of new born babies and preschool children do not reach the level of adults, so that the scene seen by them appears behind the retina, forming physiological hyperopia. This part of the positive diopter is what we called Hyperopia Reserve.
In general, the eyes of newborn babies are hyperopic. For children under 5 years old, the standard of normal vision differs from that of adults, and this standard is closely related to age.
Poor eye care habits and long-time staring at the screen of electronic products, such as mobile phone or tablet PC, will accelerate the consumption of the physiological hyperopia and cause myopia. For example, a 6- or 7-year-old child has a hyperopia reserve of 50 diopters, that means this child is likely to become nearsighted in elementary school.
|
Age Group |
Hyperopia Reserve |
|
4-5 years old |
+2.10 to +2.20 |
|
6-7 years old |
+1.75 to +2.00 |
|
8 years old |
+1.50 |
|
9 years old |
+1.25 |
|
10 years old |
+1.00 |
|
11 years old |
+0.75 |
|
12 years old |
+0.50 |
The hyperopia reserve can be considered as a protective factor for the eyes. Generally speaking, the optic axis will become stable until the age of 18, and the diopters of myopia will also be stable accordingly. Therefore, maintaining an appropriate hyperopia reserve in preschool can slow down the process of optic axis growth, so that the children will not become myopia so quickly.
How to maintain an appropriate hyperopia reserve?
Heredity, environment and diet play a big role in a child's hyperopia reserve. Among them, the latter two controllable factors deserve more attention.
Environmental factor
The biggest impact of environmental factors is electronic products. World Health Organization has issued the guidelines for children's screen-viewing time, requiring that children should not use electronic screens before the age of 2.
At the same time, Children should participate in the physical exercise actively. More than 2 hours of outdoor activities per day is significant to the prevention of myopia.
Dietary factor
A survey in China shows that the occurrence of myopia is closely related to low blood calcium. Long-term excessive consumption of sweets is an important reason for the reduction of blood calcium content.
So preschool children should have the healthy food collocation and eat less sweats, which will have a great effect on the preservation of hyperopia reserve.