Many parents are confused about this: if one eye is nearsighted and the other isn't, is correction necessary? While they can see clearly without glasses, their eyes sometimes get tired, and they might even experience dizziness and nausea… What should they do?
Generally, during eye development, almost everyone's refractive state has some degree of difference; completely identical refractive errors are rare. However, if the refractive error difference between the two eyes exceeds 250 degrees, it is clinically termed anisometropia. If not corrected in time, it can lead to faster vision decline in the "weaker" eye, amblyopia in one eye, exotropia, etc.
If anisometropia exists in both eyes, it will have a significant impact on eye development, mainly manifested in the following aspects:
NO.1 Eye Fatigue
Anisometropia causes a large difference in refractive power between the two eyes, easily leading to eye fatigue, dry eyes, tearing, headaches, nausea, dizziness, and other consequences. Furthermore, it may cause inaccuracies in judging distances and angles, potentially endangering personal safety when walking or driving.
NO.2 The "Worse Eye" Experiences Faster Vision Decline
There's a principle in eye use—"use it or lose it"—meaning the better eye is used frequently, while the weaker eye is gradually neglected. This leads to a faster increase in myopia and a faster decline in vision in the weaker eye.
NO.3 Can Lead to Amblyopia/Exotropia in One Eye
When a child has anisometropia (different refractive power between the two eyes), the eye with the smaller refractive power sees things more clearly, while the eye with the larger refractive power sees things less clearly. The brain cannot fuse the two images of different clarity.
The brain then commands the eye with the smaller refractive power to work, while inhibiting the eye with the larger refractive power. Over time, the eye with the larger refractive power will develop amblyopia (lazy eye).
As mentioned above, when a child has anisometropia, the visual development of the eye with weaker vision is also inhibited. If not effectively treated, the eye with weaker vision may eventually develop exotropia (exotropia).
No. 4 How to Prevent Anisometropia
In daily life, avoid tilting your head when viewing near objects. The object should be placed in front of both eyes and focused on simultaneously. Habitually sleeping on your side and incorrect pen-holding posture can lead to varying degrees of anisometropia and should be corrected promptly.
Additionally, appropriate supplementation with Vitamin A and lutein can help relieve eye strain and protect the eyes.
Post time: Dec-26-2025