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Ishihara Test for Color Blindness in Railway ALP 2026: A Complete Guide | रेलवे एएलपी 2026 में इशिहारा टेस्ट: एक विस्तृत मार्गदर्शिका

Decoding the Ishihara Test: Your Guide to Color Blindness Check for RRB ALP 2026 | इशिहारा टेस्ट को समझें: आरआरबी एएलपी 2026 के लिए कलर ब्लाइंडनेस जांच पर आपका मार्गदर्शन

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Updated: 2026-05-06 · 8 min read

रेलवे भर्ती बोर्ड (RRB) असिस्टेंट लोको पायलट (ALP) परीक्षा भारत में सबसे प्रतिष्ठित सरकारी नौकरियों में से एक है। इस पद के लिए चयन प्रक्रिया में लिखित परीक्षा के साथ-साथ एक कठोर मेडिकल फिटनेस टेस्ट भी शामिल है, जिसमें 'कलर ब्लाइंडनेस' (Color Blindness) की जांच एक महत्वपूर्ण चरण है। इस जांच के लिए मुख्य रूप से इशिहारा टेस्ट (Ishihara Test) का उपयोग किया जाता है। Unictest आपको आरआरबी एएलपी 2026 के लिए इस महत्वपूर्ण मेडिकल टेस्ट की पूरी जानकारी प्रदान करता है।


What is the Ishihara Test? | इशिहारा टेस्ट क्या है?

The Ishihara test is a globally recognized color perception test for red-green color deficiencies. It was named after its designer, Dr. Shinobu Ishihara, a Japanese ophthalmologist. This test consists of a series of plates, known as Ishihara plates, each containing a circle of dots appearing randomized in color and size. Within the pattern are numbers or shapes printed in a color that a person with normal color vision can see, but a person with a red-green color deficiency cannot, or vice-versa.


यह टेस्ट विभिन्न रंगों और आकारों के डॉट्स से बनी प्लेटों की एक श्रृंखला से मिलकर बनता है। इन डॉट्स के बीच में, सामान्य रंग दृष्टि वाले व्यक्ति के लिए एक संख्या या पैटर्न स्पष्ट रूप से दिखाई देता है, जबकि रंग दृष्टि दोष वाले व्यक्ति को यह या तो बिल्कुल दिखाई नहीं देता या कुछ और दिखाई देता है। रेलवे एएलपी जैसे पदों के लिए यह टेस्ट अत्यंत महत्वपूर्ण है क्योंकि लोको पायलट को सिग्नल और अन्य सुरक्षा-संबंधी संकेतों को सही ढंग से पहचानने की आवश्यकता होती है, जिनमें रंग एक महत्वपूर्ण भूमिका निभाते हैं।


Why is Color Vision Crucial for Railway ALP? | रेलवे एएलपी के लिए रंग दृष्टि क्यों महत्वपूर्ण है?

An Assistant Loco Pilot's primary responsibility involves operating trains and ensuring the safety of passengers and goods. This critical role demands flawless perception of various colored signals, lights, and indicators used in railway operations. For instance, red signals indicate stop, green signals indicate go, and yellow signals indicate caution. Any inability to distinguish between these colors can lead to severe accidents and jeopardize countless lives.


  • Safety First: Correct identification of signal colors (Red, Green, Yellow) is paramount for safe train operation.
  • Operational Efficiency: Misinterpreting signals can lead to delays and operational inefficiencies.
  • Emergency Response: Quick and accurate response in emergencies often depends on recognizing color-coded indicators.
  • International Standards: Railway safety standards globally emphasize strict color vision requirements for train operators.

Note: The RRB ALP medical examination, particularly the Ishihara test, is non-negotiable. Candidates with any degree of color blindness are generally deemed unfit for the Assistant Loco Pilot post. Therefore, understanding this test and your own vision capabilities beforehand is crucial for aspiring candidates.

How the Ishihara Test is Conducted for RRB ALP | आरआरबी एएलपी के लिए इशिहारा टेस्ट कैसे आयोजित किया जाता है

The Ishihara test for RRB ALP is typically conducted by a panel of railway doctors during the medical examination phase. Candidates are usually asked to sit in a well-lit room and identify numbers or patterns within the Ishihara plates. There are various types of plates, each designed to detect specific types of color vision deficiencies:


  • Demonstration Plate: The first plate, usually showing the number '12', is visible to everyone, including those with color blindness. It's used to explain the test process.
  • Transformation Plates: These plates show a number to those with normal vision, and a different number (or no number) to those with color blindness.
  • Disappearing Plates: Normal vision individuals can see a number, but those with color blindness cannot see anything.
  • Hidden Digit Plates: Only those with color blindness can see a number, while normal vision individuals cannot. These are less common for basic screening but can be part of a comprehensive test.

Candidates are usually given a few seconds (e.g., 3-5 seconds) to identify the number on each plate. The entire test usually takes only a few minutes. The results are recorded, and based on the number of correctly identified plates, a determination is made regarding the candidate's color vision status.


RRB ALP Medical Standards for Vision | आरआरबी एएलपी के लिए दृष्टि संबंधी मेडिकल मानक

Apart from the Ishihara test, the RRB ALP medical examination includes a comprehensive eye check-up. The general vision standards for ALP (Medical Standard A-1) are very strict:


  • Distant Vision: 6/6 without glasses, fogging test (must not show any morbid condition of eye like progressive ophthalmic diseases).
  • Near Vision: Sn 0.6, 0.6 without glasses.
  • Color Vision: Must pass the Ishihara Test for Color Blindness. Candidates must be able to distinguish between different colors (Red, Green, Yellow).
  • Field of Vision: Normal.
  • Binocular Vision: Normal.
  • Refractive Error: No refractive error allowed. Lasik surgery is generally not permitted for A-1 category posts.

Important: Candidates are advised to get their eyes checked by a qualified ophthalmologist well in advance of the examination to ascertain their eligibility. Early detection of any issues can help in understanding the implications for their ALP aspirations.

Recommended Resources

Medical StandardDistant Vision (Without Glasses)Near Vision (Without Glasses)Color VisionSpecial Condition/Remarks
A-1 (ALP, Loco Pilot)6/6Sn 0.6, 0.6Must pass Ishihara TestNo refractive error, no Lasik, no morbid eye condition.
B-1 (Certain Technicians)6/9, 6/12 (with or without glasses)Sn 0.6, 0.6 (with or without glasses)Must pass Ishihara Test (less strict in some cases)Power of lenses not to exceed +4D or -4D.
B-2 (Certain Technicians)6/9, 6/12 (with or without glasses)Sn 0.6, 0.6 (with or without glasses)Required for specific tasks (e.g., electrical)Power of lenses not to exceed +4D or -4D.
C-1 (Ministerial, Clerk)6/12, Nil (with or without glasses)Sn 0.6 combined (with or without glasses)Not requiredAny degree of color blindness is acceptable.
C-2 (Office Staff)6/12, Nil (with or without glasses)Sn 0.6 combined (with or without glasses)Not requiredAny degree of color blindness is acceptable.

What if I have Color Blindness? | यदि मुझे कलर ब्लाइंडनेस है तो क्या होगा?

Unfortunately, for posts like Assistant Loco Pilot (ALP) which fall under the A-1 medical category, candidates must possess normal color vision. If a candidate fails the Ishihara test, they are generally declared medically unfit for the ALP post. There is no 'cure' for color blindness, and therefore, no way to pass the test if one genuinely has a deficiency. However, failing the color vision test for ALP does not mean the end of your government job aspirations. Many other railway posts (e.g., Technician, Junior Engineer in certain departments) or other government exams may have less stringent color vision requirements or none at all.


Warning: Do not attempt to memorize the Ishihara plates or use any 'tricks' to pass the test. The medical board is highly experienced, and any such attempt can lead to disqualification and potentially jeopardize your future chances for government jobs.


Preparing for the Medical Examination | मेडिकल परीक्षा की तैयारी

While you cannot 'prepare' to overcome color blindness, you can prepare for the overall medical examination by ensuring good health. Here are some tips:


  • Regular Eye Check-up: Get your eyes checked regularly to ensure general eye health.
  • Healthy Lifestyle: Maintain a balanced diet, get adequate sleep, and avoid excessive screen time.
  • Avoid Stress: Stay calm and composed during the medical examination.
  • Authentic Information: Rely only on official RRB notifications and Unictest for accurate information regarding medical standards.

Unictest provides comprehensive study material and mock tests for the RRB ALP 2026 exam. While we cannot help with medical conditions, we ensure you are fully prepared for the written stages. Visit our platform for the latest updates and exam preparation resources. Start Your RRB ALP Preparation with Unictest Today!

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Frequently Asked Questions (RRB ALP)

The Ishihara Test is a diagnostic tool used to detect red-green color blindness. It is mandatory for RRB ALP 2026 because Assistant Loco Pilots must accurately distinguish between various colored signals (red, green, yellow) to ensure railway safety and efficient train operations. Failure to do so can lead to severe accidents, making perfect color vision a non-negotiable requirement for this A-1 medical category post.

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