You can become a police officer if you are color blind, but whether you actually will depends on how severe your deficiency is and which agency you apply to. Some departments disqualify anyone who fails the standard plate test. Others let you pass with an alternative test that measures whether your color discrimination is good enough to do the job. Mild red-green deficiency is often workable; complete dichromacy is much harder to get past screening.
How Your Type of Color Blindness Changes Your Odds
Severity matters more than the label. Red-green deficiency accounts for the overwhelming majority of cases, affecting about 8 percent of men and 0.4 percent of women of European descent,1PubMed. Worldwide Prevalence of Red-Green Color Deficiency but within that category the range is wide:
- Deuteranomaly is the mildest and most common form, affecting roughly 5 percent of males. Greens look slightly shifted, but most colors are still distinguishable. This is the group most likely to pass alternative screening.2National Center for Biotechnology Information. Prevalence of Congenital Color Deficiencies
- Protanomaly affects about 1 percent of males. Reds look duller and darker, which can matter for signals and indicators at a distance.
- Deuteranopia and protanopia are the complete forms, affecting roughly 1 to 1.5 percent of males. Red and green cannot be distinguished at all, and passing alternative tests is much harder.
- Tritanopia (blue-yellow) is rare and less often tested in law enforcement screening.
If your deficiency is mild, the practical question is whether the department you’re applying to uses testing that can pick that up. If your deficiency is severe, you have fewer paths, but the answer still isn’t automatically no.
What the Tests Actually Measure
Nearly every agency that screens for color vision starts with the Ishihara plates. You look at fields of colored dots and read the number hidden inside. It’s designed to catch red-green deficiency, and it’s sensitive enough that people with mild anomalous trichromacy often fail it. At some departments, that failure is final. At others, it’s just the first step.
The Farnsworth D-15
When a department offers a second chance, the follow-up is usually the Farnsworth D-15. You arrange 15 colored caps in order by hue. The D-15 isn’t looking for perfect color vision; it’s looking for functional color discrimination. People with mild deuteranomaly frequently pass the D-15 after failing the Ishihara, because the D-15 is built to catch moderate-to-severe deficiency rather than small shifts in perception. It must be taken without any color-corrective lenses.
Lantern Tests
Some agencies use a lantern test, which shows pairs of colored lights (red, green, and white) that you have to name. This more closely mimics what an officer would see with traffic signals and emergency lights. The Farnsworth Lantern (FALANT), developed originally for the Navy, has been used in law enforcement, though it’s less common than the D-15.
What a Failing Score Actually Means
Failing the Ishihara and failing a department’s color vision requirement are not the same thing. Whether one leads to the other depends on the department’s written policy. Ask before you assume you’re out.
The Department You Apply to Matters More Than Your Diagnosis
Color vision standards in American policing are not uniform. Roughly two-thirds of states set no statewide color vision standard for police officers, leaving each agency to write its own. The remaining states set a minimum through their Peace Officer Standards and Training (POST) commission, and individual departments within those states can still impose stricter rules on top.
The result is a patchwork. A large urban department might require a clean Ishihara with no alternative testing. A suburban department in the same state might accept the D-15. A department in a state with no POST color vision mandate might not test for it at all. Applying only to one agency, taking a rejection, and concluding the career is closed is a common mistake.
Federal agencies add another layer. The FBI screens for color vision during its medical evaluation, though the specific passing criteria are not publicly detailed.3FBI Jobs. Fitness-for-Duty Medical Requirements National guidelines published for law enforcement medical evaluations recommend corrected distance visual acuity of 20/20 binocularly, with at least 20/40 in each eye, and an ophthalmologist or optometrist evaluation for anyone who can’t meet that.4Public Safety Medicine. Visual Function and Disorders Those are recommendations. Individual agencies decide what to enforce.
What to Do If You Fail a Color Vision Screening
A failed screening isn’t automatically the end of the process. The practical steps, in order:
- Ask about alternative tests. If you failed the Ishihara, ask in writing whether the department accepts the Farnsworth D-15 or a lantern test. Some offer it automatically; others only if you request it. For mild deficiency, the D-15 is often the best shot.
- Get an independent evaluation. An ophthalmologist who does occupational vision testing can document the exact type and severity of your deficiency, which carries more weight than a pass/fail screening result. Some departments accept outside evaluations on appeal. A thorough workup runs roughly $100 to $225, though costs vary.
- File a formal appeal if one exists. Many agencies have an appeal process for medical disqualifications, and independent documentation strengthens it.
- Apply to other departments. This is the most underused option. Standards vary enough between agencies that a person disqualified at one may be qualified at another in the same region.
One rule almost every agency shares: color-corrective lenses like EnChroma glasses or X-Chrom contacts are not allowed during testing. You have to pass with your natural, uncorrected vision. Those products can help in daily life; they will not get you through an employment exam.
Your Rights Under the ADA
The Americans with Disabilities Act covers color vision deficiency as a visual impairment.5U.S. Equal Employment Opportunity Commission. Visual Disabilities in the Workplace and the Americans with Disabilities Act Under the ADA, an employment test that screens out people with disabilities must be “job-related for the position in question and consistent with business necessity.”6Office of the Law Revision Counsel. 42 USC 12112 – Discrimination A department can’t reject you based on generalized assumptions about what color-blind people can do.
When a department argues normal color vision is a safety necessity, the legal standard is “direct threat” — a significant risk of substantial harm that can’t be reduced through reasonable accommodation. That determination has to be individualized, based on your actual abilities and the specific job duties, not a blanket rule that failing the Ishihara equals unfit.7U.S. Equal Employment Opportunity Commission. Enforcement Guidance on Disability-Related Inquiries and Medical Examinations of Employees
In practice, courts have generally sided with agencies that can tie their color vision requirements to essential job functions. Several federal cases involving color-blind police applicants have been decided for the department at summary judgment. A challenge is winnable in theory, especially against a department that uses only the Ishihara with no alternative testing and no individualized assessment. It is also expensive and uncertain. For most applicants, finding a department with more flexible standards is a faster route than litigation.
Roles With Different Color Vision Demands
Not every role in a department carries the same standard. Patrol officers handle the widest range of color-dependent tasks and usually face the strictest screening. Specialized units such as bomb disposal, where color-coded wires must be distinguished, can carry additional requirements on top.
Roles that are more administrative, investigative, or community-oriented may weigh color perception less heavily. Applicants who can’t clear patrol standards sometimes find a way in through civilian analyst positions, dispatch, or other support roles that don’t require sworn officer medical clearance. These aren’t sworn police work, but they are careers in law enforcement that color vision deficiency won’t close off.
Meeting every other qualification won’t help if you can’t clear color vision screening at the department you want. But failing one department’s screening isn’t the same as failing the career. With thousands of agencies and no single national standard, the right department for a mild-to-moderate deficiency usually exists. It may just not be the first one on your list.