Visual Impairment— Driving-Related Fact Sheet For Medical Professionals

NHTSA · 2023 · ROSA P / United States. Department of Transportation. National Highway Traffic Safety Administration

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Summary

This 2023 fact sheet from the National Highway Traffic Safety Administration (NHTSA) addresses the impact of visual impairments on driving safety, providing guidance for medical professionals. The document aims to clarify how specific visual conditions affect driving performance and outlines clinical recommendations for managing patient fitness to drive. It focuses on two primary metrics: visual acuity, defined as the ability to see small details at a distance, and visual field, which encompasses the total area visible when looking forward, including peripheral vision. Common causes of impairment cited include cataracts, diabetic retinopathy, macular degeneration, glaucoma, and injuries to the eye. The paper details the specific effects of these impairments on driving tasks. Visual acuity is primarily linked to the ability to read highway signs and identify lane markings; drivers with reduced acuity are more prone to errors in identifying signs at a distance. Visual field impairment, particularly when severe and bilateral, elevates crash risk. Drivers with peripheral vision loss, such as those with glaucoma, may fail to notice traffic signs, vehicles, or pedestrians entering their path. The text emphasizes that motor vehicle crashes and driving impairment correlate more strongly with visual field loss, contrast sensitivity, and visual processing speed than with static visual acuity alone. Cataracts are noted to commonly affect both visual acuity and contrast sensitivity. Regarding clinical practice, the document advises clinicians to ensure drivers adhere to state statutory requirements and to recognize that any condition lowering visual acuity or field may render a driver unfit for unrestricted driving. Recommendations include limiting driving for patients with glare recovery issues to daytime and good weather conditions. For cataract patients, surgical treatment is suggested to maintain safe driving capabilities. Clinicians are urged to consider evaluating visual processing speed for patients with cognitive changes following stroke or traumatic head injury. Patients with decreased far visual acuity should be advised to restrict driving to low-risk conditions, such as familiar surroundings, non-rush hour traffic, and low-speed areas. If vision is the sole issue and falls below the standard 20/40 threshold or state guidelines, referral to an eye specialist is recommended. For patients with visual acuity deficits combined with other conditions like cognitive problems or hearing loss, an on-road assessment by a driver rehabilitation specialist is advised. Additionally, sudden monocular vision loss requires a period of adaptation before resuming driving.

Key finding

Visual field loss, contrast sensitivity, and visual processing speed are more strongly correlated with motor vehicle crashes and driving impairment than static visual acuity alone.

Methodology

review

Provenance

The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via bulk_ingest_rosap on 2026-05-23 (7 acquisition events logged).

Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

Ranked by relevance to this paper. Hover a topic for its definition.

• sensory abilities
• disability glare
• useful field of view
• age related perceptual decline
• visual occlusion
• dark adaptation mesopic