Hello, It will be a pleasure to try and help with your concerns.
You can get neck pains from strain on your neck, tingling that goes down your arms, eye strain, redness and watering from the eyes,
Loss of visual acuity, that the need to put on spectacles
if there is too much gaming, that is flashy lights etc, then these can be eppileptogenic, that is they can cause seizures.
I hope this helps
Please let me know if you need any clarifications, I would be glad to help.