Can wearing glasses cause strabismus?

In general, properly wearing suitable glasses does not cause strabismus; on the contrary, it can help prevent and correct certain types of strabismus. However, improper eyeglass prescriptions or prolonged use of ill-fitting glasses may trigger or worsen strabismus. The details are as follows:

Uncorrected refractive errors such as myopia or hyperopia can lead to persistent eye muscle fatigue due to excessive focusing effort, resulting in imbalance of ocular muscle strength and eventually causing strabismus. Wearing accurately prescribed glasses helps the eyes form clear images, reduces accommodative strain, promotes coordinated eye muscle function, and thus prevents strabismus. In cases where mild strabismus has already developed, proper glasses can also assist in correction.

If the lens prescription is too strong or too weak, or if the pupillary distance is measured incorrectly, the eyes are forced into abnormal focusing states. Over time, the extraocular muscles may become imbalanced due to chronic over-tension or relaxation, leading to strabismus. This is especially true for children, whose eyes are still developing—improperly fitted glasses can have a more pronounced negative impact on eye muscle development and increase the risk of strabismus.

It is important to obtain prescriptions from reputable hospitals or optical institutions, have regular eye examinations, and update glasses prescriptions as needed. Avoid prolonged near-work activities; take visual breaks by looking into the distance every 40 minutes. Children should develop healthy visual habits and undergo routine eye check-ups to ensure their glasses always match their current eye condition.