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 factors. But regardless of the cause, the first step is a visit to the optometrist 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.
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Or: When is the best time to go for an eye sight test?