Hi! If the pain occurs only while reading it could be because you have diminished vision in one or both your eyes causing increased strain to your eyes and eye pain. Pls get your vision checked at an ophthalmology clinic ASAP.
Next Steps
Consult and ophthalmologist for vision test
Health Tips
Avoid reading in dim lit rooms and for prolonged periods of time . Follow the 20-20-20 rule …after reading continuously for 20 minutes look at objects at least 20 feet away for a period of 20 seconds before continuing near work