"The child is myopic, I suggest you have his eye axis measured"! Doctor, I've already had the phototherapy, so I can just wear glasses. Is it necessary to measure the axial length of the eye?
Optometry doctors said that it is very necessary
What is the axial length of the eye
The axial length refers to the distance from the outermost layer that receives light to the innermost layer of the eyeball, that is, from the cornea - lens - vitreous body - retina (the innermost part that senses light) The distance from a central axis of the layer). In short, it is the length of the eyeball from front to back, which is equivalent to the height of a person's height from the ground to the top of the head. Measuring the axial length of the eye is like measuring the "height" of the eye.
So, why is myopia increasing?
The essence is the extension of the axial length of the eye
Why should the axial length be measured
1. Observe the progression of myopia/objective indicators of treatment effectiveness
For children whose axial length exceeds the normal value for their age, we usually recommend delaying the treatment of axial lengthening Solutions (such as 0.01% atropine , OK lens , peripheral defocused soft lens and peripheral defocused frame lens, etc.). Is
treatment effective? Regular axial measurements are a very good objective indicator.
2. The assessment found the risk of pathological high myopia
Why can’t the degree of myopia increase too high? Not only because the glasses are too large, but also because the axial length of the eyeball is too long (excessive stretching of the eyeball), it can easily lead to a series of pathological changes in the eye, called pathological myopia .
When the axial length of the eye exceeds 27mm, the risk of pathological myopia increases greatly.
Pathological high myopia does not only occur in people with high myopia exceeding 600 degrees. Some children with low myopia have long axial length of their eyes with high myopia. They need to take measures as early as possible to delay the growth of their axial length.
3. Indications for surgery for high myopia
Due to genetic and other factors, some children’s axial length is higher than normal and grows rapidly; or for people with pathological myopia, the degree of myopia continues to increase after adulthood, and the axial length of the eye continues to increase. extend. At this time, it is necessary to regularly review the axial length of the eye to see if it meets the surgical indications for posterior scleropexy.
Indications for surgery:
html Children aged 13-17: The axial length of the eye is 27mm. In the past 3 years of follow-up, the axial length of the eye was 1.0mm, and the myopia refractive index deepened by more than 100 degrees every year.
Adults over 118 years old: Eye axis>28mm. In the past 5 years of follow-up, the axial length of the eye was >1.0mm, and the myopia diopter deepened by more than 50 degrees every year; or it was accompanied by fundus lesions , such as retinal hemorrhage, macular schisis, macular hole and macular retinal detachment.
4. Discovering the Hidden High Hyperopia
Children have super adjustment ability, so they sometimes secretly hide the truth of "high hyperopia", which manifests as normal computer refraction or even normal vision, preventing timely and effective treatment. And ocular axial measurement can make the truth nowhere to hide.
