First reason is refractive error.
Second reason is convergence insufficiency.
Convergence Insufficiency (CI) is characterized by a decreased ability to converge the eyes and maintain binocular fusion while focusing on a near target.
This can be due to more usage of digital devices.
Next Steps
consult pediatric ophthalmologists) squint specialist for further evaluation.
glass power check up
and NPC should be checked
Health Tips
convergence exercise can be done.