Experts from Kejian Wumei Ophthalmology remind us: The parameters of computerized refractometry are set based on the average value of human vision. Therefore, there will always be a difference between the results of computerized refractometry and each individual's true vision. Choosing medical refractometry is the prerequisite for accurate glasses prescription. Compared with traditional medical refractometry methods, computerized refractometry is more convenient and faster - just place your head on a special instrument, focus each eye on the image on the screen separately, and it's OK once you see clearly! However, experts warn that computerized refractometry should not be used as a "prescription for glasses". Especially for teenagers, computerized refractometry can easily lead to "over-correction", which may cause "pseudo-myopia" to develop into "true myopia".
The parameters of computerized refractometry are set based on the average value of human vision. Therefore, there will always be a difference between the results of computerized refractometry and each individual's true vision. Accurate refractometry needs to consider not only the refraction degree of each eye but also the balance between both eyes. However, computerized refractometry usually tests one eye at a time, so it cannot definitely take into account the coordination of both eyes. More importantly, for people especially teenagers, refraction degree cannot only be based on static refraction degree. Refractometry after pupil dilation should be performed to obtain the real refraction degree.
The greater harm of computerized refractometry lies in causing "over-correction" of the prescription degree. The correction degree for nearsightedness should be the lowest degree that provides the best vision. However, many merchants give consumers the degree that allows them to "see the clearest", which actually belongs to "over-correction". In order to adapt to this degree, the vision of eyes wearing such glasses for a long time will decline rapidly. A large number of surveys, especially those on long-term glasses wearers, show that the possibility of visual fatigue occurring when wearing glasses after medical refractometry is extremely low.
Experts remind:
1. The following groups must undergo medical refractometry:
1) Teenagers under 15 years old.
2) First-time glasses wearers.
3) Those who experience visual fatigue while wearing glasses.
4) Those with significant differences in refraction between both eyes.
5) Those who have had eye diseases.
6) Those who need refractive surgery.
7) Those whose myopia degree increases rapidly in a short period, such as an increase of 100 degrees within half a year.
2. Refractometry cycle: Since teenagers under 18 years old are still in the process of eye development, if they are nearsighted, they must undergo medical refractometry every year; if they are farsighted, they need to do it every six months before undergoing LASIK surgery.
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