Hello this could be due to convergence insufficiency or dryness you can use lubricating eyedrop like flogel 4 times daily. if problem persist, consult local ophthalmologist and get convergence checked

Eat carrots😮that's all??anyways find another ophthalmologist who can do cycloplegic refraction.you must hyperopic that's why you are not able to concentrate for near work and as you go nearer you will find more problem.you will be having plus numbers.get your eyes properly checked from proper ophthalmologist. And then let me the result

You may have an uncorrected refractive error, muscle imbalance, convergence or accommodative insufficiency. Consult an Ophthalmologist to get your refraction done. Also,There are exercises for your eyes to improve muscle imbalance. Eating carrots without considering these problems is not going to be of much use.