Eyesight can depend on how the ears process information too, according to a recent study.
The findings of the survey, undertaken at Brunel University"s School of Social Sciences, were published in Current Biology and may be of interest to those who wear corrective contact lenses or glasses.
Study subjects were shown red bars moving across a screen accompanied by a sound, such as a sequence of beeps.
Psychologist Dr Elliot Freeman concluded from the experiment that the perceived direction of motion from an object - or red lines - depended on minute variations in the timing of the accompanying sound.
A good example of how ears complement the eyesight is people"s ability to identify who is saying what in a noisy crowd.
Mr Freeman hopes his research could "eventually be useful in detecting and diagnosing subtle perceptual differences thought to be characteristic of certain clinical conditions such as dyslexia and autistic spectrum".
While booking an appointment at the opticians, some people could consider a hearing test with an audiologist too.
by Alexa Kaczka