I'm Zhao Xiaodao and I'm an ophthalmologist.
Parents who are very concerned about their children's vision health will comprehensively use many myopia prevention and control methods to add points to myopia prevention and control from all angles.
A parent of a child who has been 4L for two years of prevention and control reported in the group that the eye axis has decreased by 0.2mm compared with two years ago, and then it has not risen again. Previously, myopia was 125 and 100 degrees, but now it is 25 and 50 degrees.
The parent mentioned that the child has been wearing OK glasses for nearly a year and a half, "It's too troublesome to wear them every day, and the child can wear them once a week, and his vision can be maintained at 1.0." Recently stopped wearing it for two months.
I almost burst out laughing when I heard her say it. When did the effect of the OK mirror reach this level, and you can wear it for a week a day?
OK lens is an excellent optical correction method: use the sleeping time at night to shape the cornea, and the visual acuity can be maintained at more than 1.0 after removal during the day, which meets the child's reluctance to wear glasses. However, this shaping is time-limited, and generally after the OK lens is removed, the shaping effect of flattening the cornea begins to recover, and if it is not corrected, it will not be clear in the afternoon. In order to maintain good vision for a day, OK lenses are usually moderately overcorrected, and they need to be worn every night to continuously shape the cornea in order to maintain good daytime vision at all times.
In addition to improving daytime vision, the key point that OK lenses can be effective in myopia prevention and control is actually the formation of myopic defocus in the peripheral retina, which is one of the 4L - Lead imaging (myopia defocus).
Optical correction myopia prevention and control methods actually rely on manufacturing imaging advance (myopia defocus) to achieve myopia prevention and control effects.
Imaging is a curved surface on the retina and can be divided into central and peripheral defocus depending on the range of defocus. Many studies have shown that the central myopia defocus and the peripheral 20-degree peripheral myopia defocus have the effect of myopia prevention and control.
In terms of comfort, the center defocus will have a foggy feeling, so it is called fog vision treatment, and the peripheral myopia defocus lens experience is better. The center and periphery can also be combined, which is called fog vision defocus.
If the child is already nearsighted and needs to wear glasses, you can create a peripheral imaging advance (peripheral defocus) on the glasses, so that the child can gain non-sensory points, and there are three options:
Functional defocus frame mirrors
The advantage is that it does not affect the visual experience, and can effectively solve the peripheral farsightedness defocus caused by eye deformation, and the myopia prevention and control score is 30~35 points
OK Lenses (Orthokeratology Lenses)
OK lenses also belong to the category of peripheral defocus technology, it belongs to contact lenses, and the advantage is that you can wear them at night, pick them up in the morning, and get clear vision the next day. The disadvantage is that it is a bit troublesome to wear, and the requirements for operation and care are relatively high. In terms of myopia prevention and control efficacy, the score is 40-50 points
Defocal soft lenses
The defocus soft lens is worn during the day and thrown away at night, and the daily disposable type is similar to the contact lenses worn by adults. Compared with the OK lens, the defocus soft lens has no compression, and there are few adverse reactions; the daily throw does not need to take time to care, saving the mother; it is worn when it is needed, and it can be switched to the frame lens at any time when it is not needed, and the economic cost is less; the prevention and control efficiency is close to that of the OK lens, 40 points. In Japan and some Western countries, the prescription volume of defocus soft lenses is much greater than that of OK lenses.
After wearing the defocus lens, when looking far away, the center point remains clear, and the surrounding area can achieve a bonus point for image advancement, and when looking close, the defocus lens can also play a certain role in adding points, although the center point has a little adjustment lag, but the surrounding arch image surface is still there.
Functional frame mirror, OK mirror, defocus soft lens can choose one of the three, the gap in prevention and control efficiency is not very obvious, parents can choose a more suitable plan according to their own family situation, children's preferences and behavioral habits. But no matter which one you choose, pay attention to wearing it for a day, otherwise the money will be spent in vain, and the effect will not be achieved.
The essential reason why this child can maintain good vision for a week by wearing OK glasses for one day is that the previous comprehensive prevention and control has achieved good results, and the myopia degree has been significantly reduced.
Well, that's all for today's sharing. The peripheral defocus method is a very important progress in the prevention and control of optometry and myopia in the ophthalmology community in the last 5-10 years, and the popularity is also very high.
I am Zhao Xiaodao
I am an ophthalmologist