Do you squint or strain your eyes to see when you are behind the wheel or scootering your way through the city? You may need glasses to see clearly all that’s ahead of you.

Blurry, unfocused vision is a symptom of all four of the most common and easily-correctable-with-glasses eye conditions: shortsightedness, farsightedness, astigmatism and presbyopia.

You are definitely not alone. As many as 1 out of every 5 drivers (which means billions of people worldwide) cannot see the road clearly because of uncorrected vision issues.

Here’s a closer look at how some of these common vision conditions can affect your road safety:

SHORTSIGHTEDNESS: Road signs in the distance appear blurry. How can this be a problem? If you can’t read the exit marker until too late, you’ll either cut over sharply (endangering yourself and others) or take the next exit and circle back.

FARSIGHTEDNESS: Are you nearly out of petrol? Are you driving too fast? It may be difficult to read those dials on your dashboard. The road safety ramifications are obvious in this case: You may be stuck on the side of the lane or ticketed for speeding.

With astigmatism, objects at near and far distances may look blurry.

With presbyopia, often called age-related nearsightedness, you will begin to have difficulty focusing on dashboards and other close-up objects starting around age 40.

The solution for each of these vision problems is a pair of glasses. See your eye care professional for an eye exam and prescription.

Get the glasses you need to be able to see clearly out your windshield (to safely exit the highway) and to make out your dashboard dials (so you aren’t surprised to hear a siren behind you).