What Are Police Looking for in the Eye Test? NPOST Vision Requirements Explained

If you are preparing for the national police officer selection test, you have probably already started reviewing math, reading, and grammar sections — but one requirement that surprises many candidates is the vision screening. Understanding what are police looking for in the eye test is essential because failing this medical component can disqualify you before you even sit down to take the written exam. Law enforcement agencies require officers to have reliable, functional vision because split-second visual judgments directly affect officer safety and public safety on the street.

The eye test used in police hiring is not a single standardized national exam like the written NPOST. Instead, it is a medical screening conducted by a licensed physician or ophthalmologist hired by the department. Most agencies follow guidelines set by their state's POST (Peace Officer Standards and Training) commission, but there is meaningful variation between departments. That said, the core standards — covering visual acuity, depth perception, color vision, and peripheral vision — appear consistently across virtually every agency in the United States.

Visual acuity is the most commonly discussed element. Agencies typically require uncorrected (without glasses or contacts) distance vision of no worse than 20/100 in each eye, though some departments allow 20/200. The critical number is the corrected standard: nearly all agencies require corrected vision of 20/20 or better in each eye when wearing glasses or contact lenses. If you currently wear corrective lenses, this means passing the eye test is very achievable — but you must bring your lenses to the medical exam and inform the examiner of your current prescription status.

Depth perception — the ability to accurately judge distances between objects — is tested because officers must gauge distances while driving at high speed, approaching suspects, and operating firearms. A standard depth perception test uses a stereoscopic device that presents slightly offset images to each eye. Candidates who lack adequate stereo vision may still qualify if their deficit is minor, but significant depth perception loss is typically disqualifying because it creates safety risks in pursuit driving and firearms qualification.

Color vision testing screens out candidates with severe color deficiencies, most commonly red-green color blindness. Officers must distinguish between signal light colors, identify the color of clothing in witness descriptions, and read color-coded maps and dispatch systems. Mild color weakness is often acceptable, but failure to distinguish between red and green on an Ishihara plate test — the standard 38-plate color vision screening tool — may result in disqualification at stricter departments. Some agencies now use the Farnsworth D-15 test, which is more lenient and focused on practical color discrimination rather than perfect hue matching.

Peripheral vision requirements exist because officers must be aware of activity in their side fields of vision without turning their heads. Standard peripheral vision screening requires at least 140 degrees of combined horizontal field, though many agencies set the bar at 150 degrees. Officers with tunnel vision or significant visual field loss are considered unsafe for patrol duty. This component is tested using a confrontation field test or a more precise automated perimetry machine at the physician's office.

One of the most important things you can do before your police medical exam is get a comprehensive eye exam from your own optometrist first. This gives you an accurate baseline and allows you to update your prescription if it has changed.

Wear or bring whichever corrective lenses you plan to use on the job, and ask your optometrist to document your corrected and uncorrected acuity for your own records. To complement your medical preparation with written test readiness, check out the national police officer selection test study guide for a full breakdown of how departments evaluate candidates across all screening phases.

When you arrive for the police medical examination, the eye test is typically one of the first components completed. The examining physician or technician will begin with a Snellen chart test — the classic wall-mounted chart with rows of letters in decreasing size. You will cover one eye at a time and read the smallest line you can see clearly. This establishes your uncorrected visual acuity baseline. If your vision is worse than the department's uncorrected standard, this is not automatically disqualifying — the examiner will then test you with your corrective lenses in place.

The corrected acuity test follows the same Snellen chart process, but now with your glasses or contacts on. Most candidates who wear prescription lenses pass this portion easily, provided their prescription is current and properly fitted. One common mistake is arriving for a medical exam wearing an outdated prescription. If your glasses are even two years old, your prescription may have shifted enough that your corrected acuity is no longer 20/20. Visit your optometrist for a fresh exam and updated lenses at least four to six weeks before your scheduled police medical appointment.

After acuity testing, the examiner moves to color vision. The most common method is the Ishihara pseudoisochromatic plate test, in which you look at a series of circular images composed of colored dots. Hidden within each circle is a number or a winding path that is only visible if your color discrimination is intact.

A person with normal color vision reads the numbers easily; someone with red-green color deficiency sees a different number or no number at all. The test has 38 plates, and the examiner typically shows a subset of 14–24 plates. Missing more than two plates on most versions is considered a failure at strict agencies.

Depth perception testing follows color vision. The Howard-Dolman apparatus is the traditional tool, presenting two vertical rods viewed through an eyepiece. You use a string to align the rods at equal distances. The examiner measures how far off your alignment is in millimeters of error. A score under 20 millimeters of average error is generally acceptable.

More modern departments use computerized stereopsis tests that present 3D images through polarized lenses and ask you to identify which of several circles appears to float above the others — a method adapted from the Randot or Titmus stereofly test used in pediatric vision screening.

Peripheral vision screening is often performed using a simple confrontation test: the examiner holds up fingers in your peripheral field while you stare at a fixed central point, and you indicate when you can see the movement. More precise measurement uses a Humphrey Visual Field Analyzer or similar automated perimetry machine.

In automated perimetry, you hold a button and press it every time you see a small light flash in different locations of your visual field. The machine maps your entire visual field and produces a printout that shows any blind spots or deficits. This printout becomes part of your medical file.

It is worth noting that monocular candidates — those who are blind or have extremely limited vision in one eye — face significant challenges in police hiring. Most departments require functional vision in both eyes, though a small number of agencies evaluate monocular candidates on a case-by-case basis depending on the specific visual demands of the position. If you have monocular vision, contact the department's human resources office directly before beginning the application process to understand whether accommodation requests are considered under their ADA policies.

Laser eye surgery such as LASIK or PRK is widely accepted by law enforcement agencies, and in many cases it dramatically improves a candidate's chances of passing the uncorrected acuity standard. Most agencies require a post-surgical waiting period — typically three to six months — before the eye exam can be completed, to ensure the prescription has fully stabilized.

If you are considering LASIK before a police application, confirm the agency's specific post-surgical waiting period requirement before scheduling your procedure. For a broader picture of all written test sections you will face, review available national police officer selection test practice resources that cover the psychological evaluation alongside the vision and medical components.

Understanding which vision conditions are correctable versus which are permanently disqualifying can save you enormous time and stress during the application process. The most important distinction is between refractive error — the simple inability of the eye to focus light correctly, which is corrected with lenses — and structural or neurological eye disease, which affects the eye's physical integrity and cannot be corrected with glasses. Refractive errors such as myopia (nearsightedness), hyperopia (farsightedness), and astigmatism are all correctable and should never prevent a well-prepared candidate from passing the police eye test.

Myopia is by far the most common vision condition among police candidates. A person with severe myopia might have uncorrected distance acuity of 20/400 or worse, meaning they are legally blind without correction. However, if corrected acuity reaches 20/20 with glasses or contacts, the candidate meets standard requirements at the vast majority of agencies.

The caveat is the uncorrected standard: departments that require 20/100 uncorrected would disqualify a 20/400 candidate even if corrected vision is perfect, because the department believes officers must be able to function briefly without eyewear in emergencies. Agencies that allow 20/200 uncorrected are more accommodating of severe myopia.

Glaucoma is a serious structural condition that increases pressure inside the eye and gradually damages the optic nerve. It is a progressive disease, meaning it worsens over time. Police medical examiners will screen intraocular pressure during the biomicroscopic exam, and elevated pressure combined with visual field loss is disqualifying at most agencies because it represents an ongoing risk of continued vision loss during a law enforcement career. Suspects who are being treated for early-stage glaucoma should disclose this proactively and provide documentation of treatment compliance and current visual field stability to give the examining physician full context.

Cataracts — clouding of the eye's crystalline lens — are more commonly associated with aging, but traumatic cataracts can occur in young adults following eye injuries. A cataract that significantly reduces best-corrected visual acuity below 20/20 is disqualifying until surgically treated. Modern cataract surgery is highly effective and results in excellent post-operative visual acuity for most patients. If you have a cataract that has been surgically removed and replaced with an intraocular lens implant, you can meet the visual acuity standard as long as your post-operative corrected vision achieves 20/20. Bring your surgeon's operative report to the medical exam.

Retinal detachment and diabetic retinopathy are disqualifying conditions at most agencies because they affect the structural integrity of the retina and can cause sudden, unpredictable vision loss. An officer who experiences sudden visual field loss or complete blindness while driving, apprehending a suspect, or firing a weapon creates an extreme safety risk. Even a fully repaired retinal detachment may disqualify a candidate at conservative agencies because the repair site is a permanent weak point. If you have a history of retinal detachment, contact the department's medical review board before investing in a full application cycle.

Strabismus — misalignment of the eyes — affects depth perception and can cause double vision in certain gaze positions. Mild strabismus that has been successfully treated with surgery or prism lenses may be acceptable if depth perception testing scores within normal limits. Untreated strabismus with significant deviation and measurable depth perception loss is typically disqualifying because of the direct impact on safe driving and firearms qualification. Amblyopia (lazy eye) that has reduced best-corrected visual acuity in the affected eye below the department's minimum standard is disqualifying if the better eye alone cannot meet the bilateral acuity requirement.

The most nuanced area of police vision standards involves borderline color vision deficiency. Many agencies now distinguish between mild and moderate color weakness using modern tests, and a candidate who fails the Ishihara plates but passes the Farnsworth D-15 test at an acceptable error score may still qualify at agencies that use the D-15 as their standard.

Some departments also allow a practical color discrimination test as a secondary evaluation — showing the candidate real-world objects and asking for color identification — as a waiver pathway. If you believe your color vision deficiency is mild, research which test your target agency uses and prepare accordingly. For comprehensive written test preparation alongside your medical readiness, explore the national police officer selection test practice questions guide covering all NPOST components.

Preparing for the police eye exam is only one part of a multi-stage evaluation process. The written national police officer selection test post — commonly called the NPOST — is typically the first formal hurdle you face, and passing it is a prerequisite to advancing to the medical and physical fitness screening stages. The NPOST assesses four core cognitive areas: arithmetic skills, reading comprehension, grammar, and incident report writing. These competencies are directly tied to police work: officers write reports, interpret statutes, perform rapid calculations, and communicate clearly under pressure every single day on the job.

The arithmetic section of the NPOST covers fundamental math skills at approximately a high-school level. Topics include fractions, percentages, ratios, basic algebra, and the interpretation of numerical tables and charts. Officers frequently perform these calculations on the job — computing driving speeds from time-distance data, converting units in evidence documentation, and interpreting crime statistics in briefing reports. The arithmetic section contains 20 questions and must be completed in 20 minutes, meaning one minute per question. There is no penalty for guessing, so leaving items blank is always a mistake — always submit an answer even when uncertain.

Reading comprehension tests your ability to understand written passages and draw accurate conclusions from them. Passages on the NPOST are written in the style of police reports, legal notices, and policy manuals — dense, procedural text that rewards careful, methodical reading. The key skill is distinguishing between what the passage explicitly states and what you are inferring.

NPOST reading questions are not designed to test your general knowledge of police work; they test your ability to extract information from the specific passage given. Candidates who try to answer from prior knowledge rather than the passage make systematic errors on this section.

The grammar section assesses standard written English — punctuation, subject-verb agreement, pronoun case, sentence structure, and word choice. Police reports are legal documents that may be read by prosecutors, defense attorneys, judges, and juries. Grammatical errors in a police report can undermine the officer's credibility and create ambiguity that defense attorneys exploit. The NPOST grammar section reflects this real-world importance by testing both correctness and clarity. Common trouble areas include comma splices, dangling modifiers, and pronoun-antecedent disagreement — review these specific topics using a targeted grammar resource rather than rereading general writing guides.

The incident report writing section is unique among written police tests because it requires candidates to produce original written work rather than selecting from multiple-choice answers. You are given a set of facts about an incident — typically a brief story or a list of witness statements — and asked to write a structured report summarizing the key information.

Scorers evaluate logical organization, completeness of key facts, appropriate language register (formal and neutral), and the absence of opinion or editorializing. Practice this section by writing timed summaries of news articles or case descriptions, forcing yourself to identify and sequence the who, what, when, where, and how without inserting personal commentary.

Timing is a frequently underestimated challenge on the NPOST. Many candidates find the reading comprehension and incident report sections most time-consuming, and they underestimate the arithmetic section's pace requirements. A structured study plan of four to six weeks typically produces the best results for average candidates. During the first two weeks, focus on identifying your weakest section through diagnostic practice.

In weeks three and four, spend concentrated time drilling the specific question types where you scored lowest. In the final two weeks, shift to full timed practice exams that simulate the real test experience, including working through all sections consecutively without breaks. To start drilling your weakest areas right now, try a national police officer selection practice test that mirrors the actual NPOST format and timing.

The passing score on the NPOST varies by agency. Some departments set the bar at a raw score of 70% correct across all sections, while others weight individual sections differently or require a minimum score within each section in addition to the overall composite score. A candidate who aces the reading section but fails to reach the arithmetic minimum may be disqualified even if the overall composite passes.

Before beginning your study plan, contact the department you are applying to and ask explicitly whether there are per-section minimums in addition to the overall passing threshold. Tailoring your preparation to the specific scoring model used by your target agency is far more efficient than generic preparation.

In the final weeks before both your written NPOST and your police medical examination, the quality of your preparation matters more than the quantity of hours. Candidates who study smartly — using timed practice sets, reviewing their mistakes systematically, and sleeping adequately — consistently outperform candidates who pull long study sessions without structure. Here are the most actionable strategies for finishing your preparation strong and walking into both the eye test and the written exam with confidence.

For the eye exam specifically, the single highest-leverage action is the optometry appointment described earlier. But there is a second important preparation step that many candidates overlook: practicing the Ishihara plate test in advance. Free versions of the Ishihara plate test are available online, and spending 15 minutes reviewing them familiarizes you with the format.

You cannot improve your color vision through practice, but you can eliminate the surprise factor and confirm in advance whether your color discrimination is likely to be flagged. If you score poorly on an online version, you have time to research which test your target agency uses and whether alternatives like the D-15 are accepted.

For the written NPOST, timed practice is irreplaceable. The most common failure mode among prepared candidates is running out of time — not lacking knowledge, but failing to manage the pace of each section. During your final two weeks of preparation, simulate the complete test experience: four sections, real time limits, no interruptions. After each practice session, categorize your errors by type rather than simply counting mistakes. An arithmetic error caused by misreading the question requires a different fix than an arithmetic error caused by not knowing the procedure — only by categorizing errors can you improve the right skill.

Sleep is a performance variable that most candidates treat as a luxury rather than a requirement. Research consistently demonstrates that sleep deprivation at the level of six hours or fewer per night degrades cognitive performance to a degree equivalent to being legally intoxicated. For both the eye test and the written exam, aim for at least seven to eight hours of sleep in the two nights before each appointment. The night before your medical exam, avoid alcohol entirely — it dehydrates the eye's surface and can worsen your acuity reading the following morning.

On the day of your written NPOST, arrive at the testing center with identification documents, any required registration confirmation, and a reliable watch or clock if allowed, since keeping personal time is valuable for pacing. Read the entire question before looking at the answer choices on multiple-choice items — this prevents the common trap of selecting the first answer that seems reasonable without evaluating all options. On the incident report section, take 60 seconds to outline your key facts before writing, then write continuously and revise only if time remains after completing the full response.

If you have already taken the NPOST and did not achieve a passing score, most agencies allow you to retake the test after a waiting period of 30 to 90 days. Use the interim period productively by returning to your practice materials and identifying exactly which question types caused the most failures.

A single focused session with a tutor or teacher on your weakest arithmetic topics can often close a gap that hours of self-study did not resolve. Many candidates who fail on their first attempt pass comfortably on the second attempt because the first experience revealed specific weak points that general preparation had missed.

The combination of a strong NPOST score and a clean medical examination — including the eye test — positions you well for the next phases of the hiring process: the oral board interview, the background investigation, the polygraph, and the psychological evaluation.

Each of these phases rewards the same qualities that the written test and medical screening assess: honesty, self-awareness, the ability to follow directions precisely, and the capacity to perform under controlled pressure. The effort you put into preparing for the NPOST written exam and the medical screening builds exactly the habits and discipline that law enforcement hiring boards are looking for in a candidate they will trust to represent their community.