For several possible reasons like glaucoma,Retinitis pigmentosa, eye strokes or occlusions, Detached retina, brain damage from stroke, neurological damage such as from optic neuritis, compressed optic nerve head (papilledema), concussions (head injuries) we may have, as a symptom, a loss of peripheral vision.
The patient vision becomes like the one shown in the picture and in some cases, like in glaucoma, this effect grows quite slowly.
To describe this situation sometimes we say that the patient's vision is like the one you may have looking through a cardboard tube.
If you drop a frog in a pot of boiling water, it will of course frantically try to clamber out. But if you place it gently in a pot of tepid water and turn the heat on low, it will float there quite placidly. As the water gradually heats up, the frog will sink into a tranquil stupor, exactly like one of us in a hot bath, and before long, with a smile on its face, it will unresistingly allow itself to be boiled to death.
The real final reason of life is for every animal, from a virus to a whale, is the perpetuation of his gene. To perpetuate the survival of our genes we need to survive enough to have childrens and to protect them until they are ready to survive and go on with this never ending mechanism. (if interested this is the reference book about: “The Selfish Gene” written by Richard Dawkins)
Charles Darwin (“On the origin of species”) has theorized that the animal that will survive better is not the strongest one, is the one that better adapts itself to changing environment.
Our brain is very well trained to adapt itself and we get used even to very strange approach to anything. Not only we get used, but we are inclined to like the way we are used to do something.
A clear demonstration of this attitude comes out every time some often used interface, Facebook, iOS, Google… , changes: even if the new one is clearly better a lot of user will say that is ugly and unusable making some confusion between personal habits and usability. In every usability session when analyzing a new solution for sure somebody will come out telling that something has been done like that for years and so is useless to change it.
This attitude is, lucky enough, not in everybody's mind and this is the reason why we no more use punched cards: they worked, but someone looked for something better!
This is another possible variant of this syndrome: “customers are using the system and on this page we do not have complains, why should we change it?”.
There are several possible reasons for not having complains from customers:
1. The page is perfect or at least very good, everything is perfectible, but if is very good the solution could be leave as it is, but not before having evaluated possible alternative solutions.
2. The function is so important, useful and often used that after the initial problems in learning it now most user find it natural, like having less peripheral vision.
3. Our system to collect complains is very poor
In other words no complains from customer could be a good new, but is not enough not to go deeper in the evaluation.
Information Technology is a rapidly evolving thing, Internet related technology evolve even faster. Not many years ago 300 baud was the standard speed of connection, web did not existed and we used Gopher, mobile connection was not even thinkable and was only 20 years ago.
Today WWW is totally different and tomorrow with the switch to HTML5 and CSS3 the leap will be even bigger. Choose like flat UI and responsiveness are becoming very common, almost a must and it is not fashion only.
In this rapidly evolving technology and design scenario the probability that something designed and built even few years ago is still the best choice is very unlikely. At least we should evaluate new possible solutions before deciding to go on with the old one.