RRB Technician Medical Standards 2026: Vision, LASIK, Colour Blindness & Fitness Rules Explained

The RRB Technician medical standards decide who gets the job after the exam. You can score well in the CBT and still lose your seat here. So it helps to know the rules before you apply.

This guide breaks down the vision rules, the LASIK question, colour blindness checks, and the fitness rules for CEN 02/2026.

The facts here come from the official RRB notification. You can read the source document on the RRB website: CEN 02/2026 Detailed Notification.

Let us start with why this stage trips up so many people. Explore more railway jobs in our dedicated Indian Railway Jobs Section and for more details on RRB Technicians recruitment visit our RRB Technician Grade 1& Grade 3 Recruitment Guide.

Why Medical Standards Matter More Than Most Candidates Realise

Many people clear the CBT, feel relaxed, and then get a shock at the medical stage. A post they picked needs sharper eyesight than they have. By then it is too late to switch.

The medical rule changes from post to post. Not every Technician job asks for the same eyesight.

Picking the wrong post can cost you the whole year.

Note: The notification says candidates found medically unfit for the post they chose will not be given another job in its place.

Now let us look at the four fitness levels used by the Railways.

Also check RRB Technician vs RRB JE: Which Railway Technical Career Is Better?

Understanding Railway Medical Categories

CEN 02/2026 uses four medical standards for Technician posts. Each one asks for a different level of eyesight.

• A-3: The strictest level. It needs the best distance vision and a full set of extra eye tests.
• B-1: A common level for most Technician Grade-III posts. It needs good vision and colour vision.
• B-2: Close to B-1, but with fewer extra tests.
• C-1: The most relaxed level. It allows weaker distance vision than the others.

We will cover each one in detail below. First, find out which one applies to you.

Which job is more suitable to you: RRB Technician vs RRB Group D: Which Post Should You Choose?

Which Medical Standard Applies to Your Technician Post?

Your medical rule depends on the post you choose. Here is the full list from the notification.

Check this useful guide How to Choose the Right RRB Zone for RRB Technician Recruitment

Note: Only one post, Track Machine, needs the A3 standard. Most main-line posts need B1. Most workshop posts need C1.

Next, let us break down what each standard checks.

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A3 Medical Standard Explained

A3 is the toughest eye standard in this recruitment. Here is what it asks for.

• Distance vision: 6/9 in each eye, with or without glasses. The lens power must not go above 2D.
• Near vision: Sn 0.6 in each eye, with or without glasses.
• Extra tests: You need to pass tests for colour vision, binocular vision, night vision, and mesopic (low-light) vision.

A3 is stricter because it covers only Track Machine work. This work happens on live tracks in poor light. So night vision and low-light vision are tested too.

Candidate Insight: If you are aiming for Track Machine, get a full eye check first. The 2D lens limit is tighter than the 4D limit for other posts. People with higher glass power often miss this one.

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B1 Medical Standard Explained

B1 covers most Technician Grade-III posts and the Grade-I Signal post. Here is the rule.

• Distance vision: 6/9 in one eye and 6/12 in the other, with or without glasses. Lens power must not go above 4D.
• Near vision: Sn 0.6 in each eye, for reading or close work.
• Colour vision: You need to pass the colour vision test. Binocular, night, and mesopic vision tests also apply.

The most common reason people fail B1 is weak colour vision. Many do not know they have a colour vision problem until this test.

Candidate Insight: B1 is the standard for the largest group of posts. If you can read colours well and your glass power is within 4D, you are likely in a safe spot for these jobs.

You may find this useful RRB Technician Grade 3 Posts Explained: Electrical, Mechanical, Workshop & Track Machine Trades

B2 and C1 Medical Standards Explained

These two standards are easier to meet than A3 and B1.

B2 asks for the same distance vision as B1 (6/9 and 6/12, up to 4D) and the same near vision. But it only needs a binocular vision test. It does not ask for a colour vision test. In this recruitment, B2 covers just the Crane Driver post.

C1 is the most relaxed. It allows distance vision of 6/12 in one eye and 6/18 in the other, with or without glasses. Near vision is Sn 0.6. It does not list a colour vision test.

C1 covers most workshop posts, like Carpenter, Machinist, Painter, Millwright, and Fitter (PU & WS). These jobs happen inside workshops, not on live tracks. So the eyesight rule is lighter.

Note: C1 allows weaker distance vision than B1. So a person who just misses B1 may still fit a C1 workshop post.

Also check RRB Technician Grade 1 Signal: Eligibility, Salary, Work Profile & Career Growth Explained

Can LASIK Candidates Apply for RRB Technician?

This is a common worry, and the notification gives a clear answer.

The rule states that people who have had LASIK surgery, or any other surgery to fix refractive error, are not eligible for posts that need the A3 standard.

• The concern is only with A3 posts (Track Machine).
• For B1, B2, and C1 posts, the notification does not bar LASIK candidates.

What to verify before you apply: If you have had LASIK, avoid the Track Machine post. Check the medical column for every post you list in your preference order. Keep your surgery records ready for the medical stage.

Colour Blindness Rules Candidates Often Ignore

Colour vision is a hidden trap. Many people skip this check and regret it later.

• A3 and B1 posts need you to pass a colour vision test.
• B2 and C1 posts do not list a colour vision test.

Colour vision matters because railway work uses coloured signals and coloured wiring. A person who cannot tell red from green can be a safety risk on these jobs.

A common wrong idea is that colour vision only matters for Signal posts. That is not true. Every B1 post, from Fitter to Welder to Diesel, needs colour vision too.

Can Candidates Wear Spectacles?

Yes. Glasses are allowed. The vision rules say “with or without glasses” for each standard.

But there is a limit on lens power.

Note: The tightest limit is for A3 posts, at 2D. If your glass power is high, a C1 workshop post may suit you better.

A common doubt is whether glasses lower your chances. They do not, as long as your corrected vision and lens power stay within the limit for that post.

What Happens If You Fail the Medical Examination of RRB Technician?

A medical rejection is not always the end. The notification allows one appeal.

• Medical rejection: This happens if you do not meet the standard for any post in your pay level on medical grounds.
• Medical appeal: You can ask for one remedial medical appeal. You need to pay the set charge and apply within the time given.
• Re-examination: If the appeal is accepted, a fresh medical check is done. Its result is final and binding. No more appeals are allowed after that.

There is one more point to note. If you are found unfit for a higher-choice post but fit for a lower-choice post in the same pay level, you may be placed in the post you fit, based on merit and vacancy.

Five Medical Mistakes Candidates Make Before Applying for RRB Technician

Small mistakes at this stage can cost you the job. Here are five to avoid.

1. Ignoring Medical Category

People pick posts by pay or interest, not by the medical column. Always check the medical standard for each post first.

2. Assuming LASIK Is Allowed Everywhere

LASIK bars you only from A3 posts. But people either avoid all posts by mistake or wrongly apply for Track Machine. Know the exact rule.

3. Never Testing Colour Vision

Many people have never taken a colour vision test. They find out about a problem only at the railway medical. Get tested early.

4. Choosing Posts Without Checking Vision Requirements

A person with weak distance vision may pick a B1 post when a C1 post would have fit better. Match your eyesight to the post.

5. Discovering Problems After CBT

Some people learn their eye problem only after they clear the CBT. By then, the post choice is locked. Check your eyes before you fill the form.

Medical Readiness Checklist Before Filling the Application Form

Run through this list before you apply.

• Get a full eye test done, covering distance and near vision.
• Take a colour vision test.
• Note your current glass power in D.
• Check the medical standard for every post you plan to list.
• Match your eye test result to the standard for those posts.
• If you have had LASIK, drop the Track Machine post.
• Keep your medical records ready for the document and medical stage.

Final Verdict

Use this simple guide to judge your medical risk.

• Low medical risk: Good vision, normal colour vision, glass power within 4D, no LASIK. Most B1 and C1 posts are open to you.
• Moderate medical risk: Weak distance vision or higher glass power. C1 workshop posts may suit you better than B1 or A3 posts.
• High medical risk: LASIK done, weak colour vision, or glass power above the post limit. Avoid A3, and check each B1 post with care.

The safest step is to get your eyes checked before you choose your posts. That one check can save your whole application.

Important Resources Related to Railway Jobs

1. Railway Jobs
2. RRB Zones List
3. RRB Technician Grade 1& Grade 3 Vacancy Analysis: Which Railway Zone Offers the Best Opportunity?
4. RRB Technician Grade 3 Posts Explained: Electrical, Mechanical, Workshop & Track Machine Trades
5. RRB Technician Grade 1 Signal: Eligibility, Salary, Work Profile & Career Growth Explained

FAQ on RRB Technician Medical Standards

1. Which Technician posts have the toughest medical standards?

The Track Machine post has the toughest standard, A3. It needs the sharpest distance vision and extra tests for night and low-light vision.

2. Can a candidate clear CBT and still lose selection because of medical issues?

Yes. If you do not meet the medical standard for your chosen post, you can be found unfit even after a good CBT score.

3. Is colour blindness a problem for all Technician posts?

No. Colour vision is needed for A3 and B1 posts. B2 and C1 posts do not list a colour vision test.

4. Are workshop-based Technician posts medically less demanding?

Yes. Most workshop posts fall under C1, which allows weaker distance vision and does not list a colour vision test.

5. Should candidates with LASIK avoid certain Technician posts?

Yes. LASIK candidates are not eligible for A3 posts, which means the Track Machine post. Other posts do not bar them.

6. Can spectacles affect eligibility for Technician recruitment?

Glasses are allowed, but each standard has a lens power limit. A3 allows up to 2D, while B1 and B2 allow up to 4D.

7. What should I do if I am unsure about my colour vision?

Get a colour vision test from an eye doctor before you apply. This helps you avoid B1 posts if you have a colour vision problem.

8. Is there any second chance after medical rejection?

Yes. You may ask for one remedial medical appeal within the set time, with the set charge. The appeal result is final.