How does your vision affect your ability
to drive?
Vision is essential when driving, but really good vision can ensure that you are a safer driver. It helps you identify road hazards, read important signs and see your dashboard clearly. When you stay aware of common vision-related changes and problems, it can help you drive more safely.
What is the level of visual function necessary for driving?
Both visual acuity and field of vision are extremely important factors of safe driving. Every state has different vision regulations for driving, so it is important to know what your local requirements are.
VISUAL ACUITY:
Visual acuity is measured by reading letters on an eye chart. This test gauges how clearly you can see. The results will determine whether you need glasses or contacts, or if you need a new prescription.
VISUAL FIELD:
Your visual field measures the width of area your eye can see when you focus on a central point. There are a few different types of visual field tests available. The visual field test most commonly used in the United States is called automated perimetry. This test involves identifying flashing lights in a special device.
There are some common vision changes that can affect driving
Age-related eye changes are normal, and some can affect your vision and your ability to drive safely. Changes that may affect driving ability include presbyopia, which may impact your ability to see your dashboard or navigation system, and dry-eye, which can reduce the quality of your vision at night.
There are additional conditions that can impact your driving vision, including:
- Glaucoma. This disease damages your eye’s optic nerve. Unfortunately there are often no warning signs or obvious symptoms in the early stages. However, as the disease progresses, blind spots can develop in your peripheral vision, or in your central vision.
- Diabetic retinopathy. This is a disease where high blood sugar levels cause damage to blood vessels in the retina. It can lead to central and peripheral vision loss.
- Cataract. People with cataracts experience a progressive clouding of the natural lens inside the eye that causes blurry vision, glare and halos around lights. Cataracts can also make it hard to see well at night, especially in inclement weather or in low light conditions. Cataracts can also diminish color vision.
- Macular degeneration. Macular degeneration damages part of the retina called the macula. This can lead to loss of central vision.
Some people notice these issues quickly and their problems become very obvious over a short period of time. Other people experience gradual loss of vision that is less noticeable. For these reasons, it is very important to have regular eye exams so your ophthalmologist can find these changes early. Prompt treatment can help avoid irreversible vision loss.
The American Academy of Ophthalmology recommends regular eye exams by an ophthalmologist starting at age 40.
Many people start to have issues driving at night
Driving at night is more challenging because the lighting is poor and more complex visual tasks are required for safe driving.
Here are some tips to help improve visibility while driving at night:
- Keep your windshield and windows, headlights and taillights clean
- Wear up-to-date corrective glasses or contact lenses
- Properly adjust all mirrors
- Make sure that your headlights are properly maintained so they light the road adequately.
If you have these eye issues get them checked out
If you notice any of the following symptoms, make an appointment with an ophthalmologist right away to avoid more serious complications:
- Blurry vision or a noticeable decrease in vision
- Halos or glare from oncoming headlights or streetlights
- A dark spot that appears in your central or peripheral vision
- Increased difficulty reading road signs or seeing pedestrians
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