Motorhead Lawyer
I'm not going to argue your other points, but two things you are fundamentally wrong on are:
1. You will not on any optical system that while there is a good spread to the adjustments for focus at closer ranges, once you get out some distance you hit the sudden jump to "infinity" focus. I indicated holding the phone at arms length which places it much closer to this point and therefore brings it much closer to, or into the depth of field. The actually depth of field is heavily influenced by the amount of light reaching your eye, whether from the actually lighting or the use of sunglbuttes. Sunglbuttes may reduce glare and provide some protection from UV, but they also reduce your depth of field by causing your pupils to dilate more. Auto glbutt absorbs much of the UV anyway.
2. Your buttertion that typing causes a shift in vision is 100% false. Reading a text message could cause a shift in vision, but typing can absolutely be done without looking at all. I can quite readily hold my phone behind my back and type. I can put a piece of paper over my computer and still type reasonably successfully, more so if I was a true touch typer. The amount of attention that typing may shift is entirely dependent on practice and skill. If you look at a stenographer their eyes are almost always focused on the person talking, and that is where their attention is as well. The act of typing, particularly on a limited keyboard is subconscious once they are proficient.
Pete C.
