What a racer sees at high speed — the cyclist's visual field on a descent Subjective view from the handlebars: a cone of sharp central vision on the road, a blurred peripheral ring, and a useful-field-of-view bubble that narrows with speed, fatigue and glare. CENTRAL VISION · ≈ 5° Line, grip, obstacle PERIPHERAL VISION Movement of the peloton, braking, a crash starting to unfold USEFUL FIELD OF VIEW Narrows at high speed, with fatigue and glare USEFUL FIELD OF VIEW 100 % at 30 km/h What a racer sees on a descent THE CYCLIST'S VISUAL FIELD AT HIGH SPEED Dynamic acuity Fast-moving target Contrast Tunnel, woodland, low light Glare Low sun, exiting a bend Dry eye Wind dries out the tear film Dr Moïse Tourabaly — docteur-lasik.fr
Useful field of view
100 %
at 30 km/h
Descent speed 30 km/h

Educational diagram — Dr Moïse Tourabaly, ophthalmologist. For information only; does not replace an examination. The useful field of view is a perceptual notion : the values illustrate a trend, not an individual measurement.