Illinois Vision Certification Practice Test

Which type of visual acuity would classify someone as having severe visual impairment?

1. Central visual acuity of 20/50 or better

2. Visual acuity of 20/200 or less

3. A field of vision greater than 40 degrees

4. Visual acuity of 20/20

The correct answer is: Visual acuity of 20/200 or less

Severe visual impairment is officially classified by visual acuity levels that indicate significant limitations in a person's ability to see. A visual acuity of 20/200 or less is a standard threshold used in vision care and rehabilitation to identify individuals who face substantial challenges in performing daily activities. This level of acuity means that what a person with normal vision can see at 200 feet, a person with this level of impairment can only see at 20 feet, demonstrating a severe reduction in visual capability. In contrast, a central visual acuity of 20/50 or better would typically denote moderate to mild visual impairment, while a field of vision greater than 40 degrees indicates a reasonable level of peripheral vision. Visual acuity of 20/20 is considered normal sight, thus not indicating any visual impairment at all. These distinctions are crucial for determining eligibility for various support services and aids, as well as for understanding the degree of impact vision has on the individual's quality of life.