Hi Tungsten_smooth! :)
My other health problems aren't eye related. I have joint hypermobility syndrome which means, for example, I can easily sprain my wrist brushing my teeth if I'm not careful. It affects my finger joints too so using a keyboard and mouse is a recipe for disaster lol. xD
I had not thought about my room lighting. I usually sit in my lounge when I'm on my phone. The lights are quite dim. A soft yellowish glow.
I had planned to purchase a new phone this year. I will definitely look into purchasing an iPad instead. The few times I've used one before, I got eye strain really quickly. I will use it a further distance + add some blue light defence. 8^) Thank you.