lens inside the eye changes its shape and
focusing power to allow us to see objects at a
close distance. It also has the ability to relax
its shape again to re-focus on distant objects.
This process is called accommodation. Accommodation
ability changes with age- being maximum when we
are very young and gradually decreasing as we
If we do an excessive amount of close work and
ask our eyes to accommodate to this close distance
for long periods of time, the muscles (and the
lens) can actually "spasm" so that they
stay over-focused. Then, when we want to re-focus
to a distant object, it may take a few extra seconds
to do it. Likewise, if we rarely do any significant
amount of close work and then ask our eyes to
look up close for long periods, it may be difficult
to bring the near objects into clear focus.
For people younger than 40 years old, this focusing
should be very quick and automatic. If it isnt,
then the eyes have undergone some excessive stress
and need some help. If youre over 40, you
have a condition known as presbyopia (prez-bee-OH-pee-ah).
This is the normal decreasing ability to focus
with age. It still can cause this slow refocusing
symptom but can easily be remedied with reading
In either case, if you notice slow refocusing
of your eyes, you should have a complete eye examination
to check the focusing ability to be sure it is
appropriate for your age and working situation.