The use of screens for retrieving all kinds of information is on the increase.
Once it was only the household TV screen that was thought to cause eye problems. Now we have TV screens all round the house, we have VDU's (visual display monitors) on our desks, in our homes, in the high street (ATM's), in our car dashboards. We carry mobile screens in the form of smart phones, we read our books on e-reader pads.
Whilst we have moved on from the days when computers were seen as the cause of short-sight, today they are more realistically seen as being potential causes of visual discomfort in otherwise healthy eyes.
We can help our eyes by taking care of them; wearing appropriate spectacle lenses, avoiding trying to read through annoying reflections, making sure screens are clean and smear free, dealing with any dry eye problems.
For the under-40's the prescription you need for reading information on a screen should (for most of you) also give you good general purpose vision. Those who may need to adapt to the new screen age are those who avoid being seen outside the house wearing their glasses. They have to remember to carry their spectacles at all times as the ring tone of a text message necessitates a scramble through the hand bag or a patting of pockets to locate the required specs to read and reply to a test. In the car the reaading only wearer finds glasses are needed to read the sat nav information ( though hopefully not for reading texts or tweets whilst driving!)
As under-40-eyes become over-40-eyes you will increasingly become aware that your arms are shrinking and the font size needs to increase till one word takes up the whole screen. This may be the time you need to rethink your vision correction and finally get around to booking that sight test.