When visual acuity begins to decline, this is often due to problems with the eye's process of accommodation. Vision accommodation refers to the focusing ability of the eye. A decline in vision can also be due to other factors, circulatory or other diseases, or temporary conditions. But regardless of the cause, the first step is a visit to the eye care professional for a quick eye test - which in many cases will be performed free of charge. A vision test takes only a few minutes and will give you some quick answers. If you are suffering from a loss of visual acuity that hasn't been corrected with glasses, your eyes will be forced to make constant accommodations. That causes eye fatigue, and can be a safety issue as well.
And what does this mean for people who wear sunglasses?
We'll tell you what happens when your eyes have to work too hard
What's important for tailor-made glasses? Knowing how a patient's eyes interact.
They changed the world with their ideas
The ZEISS Vision Science Lab at the University of Tübingen in Germany carries out fundamental research into vision