I experience this as one of my symptoms of food sensitivity (and technically POIS)
Garlic & fenugreek seem to improve this to some degree, but I need to retest. Similar to 'eye pain', although it’s more like the eyes just don’t focus or relax normally upon 1 spot.
https://my.clevelandclinic.org/health/symptoms/17796-eye-pain. From the page: Eye pain can affect one or both eyes. You can have eye pain because of things like injuries,
inflammation and infections.Many of my food sensitivity symptoms are very infection-like: muscle weakness, throat fatigue, eye pain - hard to focus as OP says, etc.
It's an odd symptom. OP put it perfectly 'The only way I can describe it is that it's difficult to focus on one single spot.'I did not experience this symptom on my animal-based protocol eating strict animal-based meals. Ever since I have been experimenting with methylation nutrients and eating more non animal-based foods did this symptom become more common. With that being said, since discovering methylation nutrients I haven't felt like I needed the raw garlic and fenugreek as much. I am going to take these more frequently and see if it fixes this symptom.