Peripheral vision varies because of anatomy, age, eye health, and, in some cases, experience. Facial structure and the health of your retina and optic nerve set the outer limits of what you can see. Attention and training seem to sharpen how well you use that outer view. A few small studies suggest athletes and action gamers may have an edge, but the evidence is limited.
What Peripheral Vision Is
Peripheral vision is everything you see outside the small central area you look at directly. It is less detailed than central vision, but it is excellent at detecting motion and alerting you to what is happening around you. It helps you notice a car in the next lane or a person stepping off a curb.
Two things get blended together in everyday talk. The first is the size of your visual field, meaning how wide an area you can detect. The second is how quickly and accurately you notice and react to things in that area. Both vary from person to person.
How Wide the Normal Field Is
A National Academies report notes that the Social Security Administration considers the normal visual field to extend about 60 degrees toward the nose and downward, 45 degrees upward, and about 85 degrees outward, as described in the National Academies report on visual field assessment.
Those are typical figures, not fixed rules. The report adds that a normal visual field relies on several anatomical factors, including clear optical media, proper focus of the retinal image, and healthy visual pathways. Your face matters too, since features such as brow and nose shape can limit what each eye sees.
Age Narrows the Field
One of the clearest differences between people is age. A study of healthy volunteers published in BMC Ophthalmology found that the peripheral visual field declined substantially from the fourth decade of life onward, while the central visual field remained quite stable, according to the published study.
Our article on how rod and cone function changes over time explains part of the story, since the periphery relies heavily on rods.
Eye Disease Can Shrink It Too
Some people have narrower peripheral vision because of disease. The National Academies report describes glaucoma as a cause of tunnel vision, which worsens as the condition progresses. Glaucoma can narrow side vision gradually, so early loss may go unnoticed.
Our guide to glaucoma versus cataracts versus AMD explains how to tell these conditions apart. If you suspect your side vision is shrinking, ask for a visual field test.
Do Athletes Really See Better at the Edges?
Research suggests experience may matter, but the picture is mixed. A study of 165 basketball players found that more experienced groups had a bigger field of vision and shorter response times to peripheral stimuli than the youngest group, according to the Polish Journal of Sport and Tourism.
That study compared groups at one point in time, so it cannot show that playing basketball widened anyone’s vision. A smaller study of nine football players and nine non-athletes found no significant difference in peripheral visual measures, although the athletes scored slightly better, as reported by the International Islamic University Malaysia. Our article on motion detection and sport looks at how elite athletes use their periphery.
Video Games and Other Experience
One study used a test of the visual field to compare habitual action video game players with controls. It found that 10 habitual players had significantly larger central and peripheral field areas than 10 controls, and that 13 congenitally deaf observers also had larger visual fields than hearing controls, per PubMed.
The samples were small, so this is an interesting hint, not a firm conclusion. It does suggest that experience and attention can shape how much of the periphery you use.
Attention, Anxiety, and Fatigue
Even on a given day, your usable peripheral vision shifts. The American Academy of Ophthalmology notes that extreme anxiety can temporarily block peripheral vision, making you feel like you can only see what is directly in front of you.
Our article on vision and athletic performance explores related skills.
Can You Improve It?
You may be able to improve how you use your periphery, though the evidence for widening the field itself is thin. Protecting eye health is more certain. Regular exams help catch conditions like glaucoma, and our guide to eye exams as you age explains how often to go.
