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Acuity is the clarity or sharpness that a person can see an object. Acuity screening targets are used in the Keystone to measure different levels of acuity such as 20/20, 20/40, 20/100, etc. The lower the second number in the set, the better the applicant's acuity. The higher the second number in a set, the worse the applicants acuity.Acuity Unrestricted License
Generally, the minimum vision for most drivers to qualify for an unrestricted license is an uncorrected acuity reading of 20/40 (both eyes together).
An applicant screened for a School Bus Endorsement or a Commercial Drivers License who is required to meet the 391 Federal Standards or drives for a Public Utilities Commission of Ohio (PUCO) regulated Company Must have visual acuity of at least 20/40 (Snellen) in each eye with or without corrective lenses.
The law requires better acuity and horizontal field levels for one eye vision than for two eye vision.
See below Vision Acuity Standards
The two stereo targets test eyes individually to indicate if a red/green discrimination deficiency exists.
An applicant to be screened for a School Bus Endorsement or a Commercial Driver License who is required to meet the 391 Federal Standard or is driving for a regulated Public Utilities Commission of Ohio (PUCO) company must have the ability to recognize the colors of traffic signals and devices showing standard red, green, and amber.
Horizontal Field is the amount of visual field, measured in degrees, that an applicant can see in each eye. To qualify for a license an applicant must have a total visual field of at least 115 degrees.There are two types of horizontal field:
Temporal Field - The degrees of field that an applicant can see to the side of their head.
Nasal Field - The degrees of field that an applicant can see across the bridge of their nose. This field is only screened when just one of the applicant's eyes can see at least 70 degrees temporal.Horizontal Field Unrestricted License
Generally, most drivers to qualify for an unrestricted license must have a temporal horizontal field of 70 degrees in each eye.
Restricted License (F1 and F2)
If applicant does not have 70 degrees temporal in both eyes but has at least 70 degrees temporal and 45 degrees nasal in one eye, he/she can obtain a restricted license as indicated by restrictions F1 and F2.
If applicant does not have 70 degrees temporal in both eyes but has at least 70 degrees temporal in one eye and 45 degrees temporal in the other eye they can be granted a restricted license as indicated by restrictions F1 and F2. These applicants cannot be tested on our Keystone Vision Viewer and will have to be referred to an ophthalmologist or optometrist. We will accept the vision results from the eye doctor as our procedure requires on the horizontal field referrals.