Normal visual acuity is described as 20/20 or 6/6 in metric. When tested, it is reported as the ratio between the test subject’s visual acuity and standard “normal” visual acuity. an eye chart with black letters on a white background). Static visual acuity, the common measure of visual acuity, is defined as the smallest detail that can be distinguished in a stationary, high contrast target (e.g. It can be described as either static or dynamic. Visual acuity is the ability of the eye to perceive details. Common vision impairments Impaired visual acuity This chapter focuses on common vision impairments and medical conditions and treatments that can cause vision impairments. Vision impairment is defined as a functional limitation of the visual system and can be manifested as: 22.7.4 Examination of visual functions (EVF).22.6.5 Loss of stereoscopic depth perception or monocularity – All drivers.22.6.4 Visual field loss – Commercial drivers.22.6.3 Visual field loss – Non-commercial drivers. 22.6.2 Impaired visual acuity – Commercial drivers.22.6.1 Impaired visual acuity – Non-commercial drivers.Vision impairment and medical fitness to drive.
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