If you are preparing for the Combined Defence Services examination and wear glasses, LASIK eligibility is probably one of the first practical questions on your mind. The short answer: yes, LASIK is allowed for CDS — but the Indian Armed Forces have specific medical criteria your corrected vision must meet, and timing your surgery correctly is just as important as clearing the written exam.
The CDS examination, conducted twice a year by UPSC, is the gateway to the Indian Military Academy (IMA), Indian Naval Academy (INA), Indian Air Force Academy (AFA), and Officers Training Academy (OTA). Each of these entry routes has defined vision standards, and candidates who have undergone LASIK or other refractive surgery are accepted — provided they meet the post-operative benchmarks at the Services Selection Board (SSB) medical. This guide covers the exact visual acuity requirements, the mandatory waiting period after surgery, which procedure gives CDS aspirants the best outcome, and the documentation you need to carry into your medical board.
Key Takeaways
- LASIK is permitted for all CDS entry routes — IMA, INA, AFA, and OTA — subject to meeting post-operative vision standards.
- Corrected visual acuity of 6/6 in the better eye and 6/9 in the worse eye (minimum) is typically required; AFA entry has stricter standards.
- A minimum waiting period of 12 months after LASIK is mandatory before the SSB medical examination.
- Stable refraction with no complications, no corneal ectasia, and documented surgical records are essential for clearance.
What Is the CDS Examination?
The Combined Defence Services (CDS) exam is conducted by UPSC twice annually — typically in February and September — to recruit officers for the Indian Military Academy (Dehradun), Indian Naval Academy (Ezhimala), Indian Air Force Academy (Dundigal), and Officers Training Academy (Chennai). After clearing the written examination, candidates undergo an SSB interview that includes a rigorous medical evaluation. Vision is one of the most scrutinised parameters in this medical, and it is the stage where many otherwise strong candidates face rejection. Understanding the vision standards before you begin your CDS preparation allows you to plan LASIK at the right time and arrive at the medical board fully compliant.
CDS Vision Standards: What the Medical Board Checks
The visual acuity requirements vary slightly depending on which academy you are applying for. For IMA and OTA entry, the standard requires a minimum of 6/6 distance vision in the better eye and 6/18 in the worse eye, correctable to 6/6 and 6/9 respectively. For the Indian Naval Academy, uncorrected vision of 6/6 and 6/9 is typically required. The Air Force Academy has the strictest criteria — candidates need uncorrected 6/6 in each eye for pilot entry, with slightly relaxed standards for ground duty branches.
Beyond visual acuity, the medical board checks colour vision (using Ishihara plates), binocular vision, field of vision, and — critically for LASIK candidates — corneal health and refractive stability. If you have had refractive surgery, the board will specifically assess whether the cornea shows any signs of ectasia, irregular astigmatism, or other post-operative complications. For an overview of the pre-operative tests that determine your suitability for surgery, see our guide on what tests are done before LASIK.
LASIK Rules for CDS Candidates
The Indian Armed Forces accept candidates who have undergone refractive surgery, including LASIK, PRK, and SMILE Pro, provided all of the following conditions are met: the surgery was performed at a recognised centre by a qualified ophthalmologist registered with a state or national medical council; a minimum of twelve months have passed since the procedure; post-operative visual acuity meets the standards for the specific entry route; refraction is stable (two consecutive tests at least six months apart showing no change); and there is no evidence of keratoconus, corneal ectasia, or significant post-surgical complications.
The pre-operative refractive error also matters. For most CDS entry routes, the original refractive error should not have exceeded approximately 3.5 dioptres of myopia or hypermetropia, and not more than 2.5 dioptres of astigmatism. If your prescription exceeds these limits, the medical board may flag it even if your post-operative acuity is perfect. For candidates with higher prescriptions, understanding the myopia power limit for LASIK is essential before proceeding.
The 12-Month Waiting Period: Why Timing Matters
The mandatory one-year gap between your LASIK surgery and the SSB medical exists for a clinical reason: the cornea needs time to heal completely and the refraction needs to stabilise. In the first three to six months after surgery, minor fluctuations in vision are normal as the corneal tissue remodels. The medical board wants to see that your vision has settled into a consistent, stable state — not that it was 6/6 at one check-up and 6/9 at another. For more on how long vision takes to settle fully, see our article on when you can see 20/20 after LASIK.
This means you need to plan backwards from your expected SSB date. If your CDS written exam is in February and the SSB is likely in May or June, your LASIK should have been completed by the previous May at the latest — giving you the full twelve-month buffer. Candidates who cut it close and arrive at the medical board with only nine or ten months post-surgery risk deferral.
Which LASIK Procedure Is Best for CDS Aspirants?
Femto LASIK
Femto LASIK is the most commonly chosen procedure for defence aspirants. It offers rapid visual recovery (most candidates achieve 6/6 within 24 hours), high precision through bladeless flap creation, and well-documented long-term outcomes that defence medical boards are familiar with. Recovery is fast enough to allow candidates to resume their physical training within a few weeks — an important consideration for SSB preparation that involves obstacle courses and outdoor tasks.
Contoura Vision
Contoura Vision is a topography-guided variant of LASIK that maps 22,000 points on the cornea for a more personalised ablation profile. For candidates with mild astigmatism or corneal irregularities, Contoura can potentially deliver sharper post-operative acuity than standard LASIK. If your pre-operative assessment shows corneal topography variations, your surgeon may recommend this approach.
SMILE Pro
SMILE Pro is a flapless, keyhole procedure that preserves more corneal structural integrity than any flap-based surgery. This is particularly relevant for CDS candidates because the Armed Forces involve physically demanding activities — combat training, parachute jumps, martial arts — where a flap-free cornea is inherently more resilient to trauma.
Documentation You Must Carry to the SSB Medical
Arriving at the SSB medical without proper surgical documentation is a common mistake that leads to unnecessary deferrals. You should carry: a surgical certificate from your operating centre stating the date, type of procedure, pre-operative refraction, and post-operative refraction; corneal topography reports (both pre- and post-operative); at least two post-operative refraction records taken six months apart demonstrating stability; a certificate from the operating surgeon confirming there are no post-operative complications; and your corneal topography printouts showing a healthy corneal profile. Keep originals and carry photocopies — the medical board may retain some documents for their records.
What Can Still Get You Disqualified?
Having LASIK does not guarantee medical clearance. The board can reject candidates if post-operative corneal topography shows signs of ectasia or abnormal thinning, if visual acuity has not stabilised to the required standard, if there is residual refractive error beyond permissible limits, if the original pre-operative myopia exceeded the allowed threshold for the specific entry route, or if any complication like significant ghosting, persistent halos, or corneal haze is detected. Candidates with pilot-entry aspirations for the Air Force face the strictest scrutiny — even minor residual aberrations can disqualify you from flying branch entry, though ground duty branches are more lenient.
Planning Your Surgery Around the CDS Calendar
The ideal approach is to get your LASIK done during your second or third year of graduation — well before you even sit for the CDS written exam. This gives your cornea ample time to heal, your refraction to stabilise, and you enough follow-up records to demonstrate stability at the medical board. If you are already in your final year, get a comprehensive pre-operative corneal assessment done immediately to check eligibility — if your cornea is suitable, schedule the procedure as early as possible to maximise your post-operative window. For candidates also considering Indian Army entry through other routes like NDA or direct entry, the same vision standards and waiting periods apply.
At Visual Aids Centre, we regularly work with defence aspirants preparing for CDS, NDA, UPSC civil services, and other government examinations that require specific vision standards. Our pre-operative assessments are designed to verify not just your LASIK eligibility but also your compliance with the precise medical standards of your target service entry.
Conclusion
LASIK is fully permitted for CDS entry across IMA, INA, AFA, and OTA — but passing the SSB medical board requires more than just having the surgery done. You need stable post-operative vision that meets the specific acuity standards for your entry route, a minimum twelve-month gap between surgery and the medical examination, clean corneal topography, and complete documentation. The smartest strategy is to plan your surgery early in your preparation cycle so you arrive at the SSB with a fully healed cornea, stable refraction, and confident documentation. If you are a CDS aspirant considering LASIK, book a consultation at Visual Aids Centre for a defence-specific pre-operative assessment tailored to your target entry route.
Frequently Asked Questions (FAQs)
Is LASIK accepted for Air Force entry through CDS?
Yes, but the Air Force has stricter standards than IMA or OTA. Pilot-branch entry requires uncorrected 6/6 in each eye, and even minor post-LASIK aberrations can lead to rejection for flying duties. Ground duty branches are more lenient.
How long before the SSB medical should I get LASIK?
A minimum of 12 months must pass between your surgery and the SSB medical. Plan for at least 14–15 months to account for scheduling uncertainties and to have two stability records six months apart.
Can the CDS medical board detect that I had LASIK?
Yes. Corneal topography and slit-lamp examination reveal the surgical interface. Do not attempt to hide your surgery — it is accepted, and concealing it can lead to permanent disqualification for dishonesty.
Is SMILE Pro also accepted for CDS, or only LASIK?
All recognised refractive procedures — including LASIK, PRK, SMILE, and SMILE Pro — are accepted for CDS entry, provided the post-operative vision meets the required standards and the waiting period is observed.
What if my pre-operative power was above -3.5D?
The medical board may flag original refractive errors exceeding the permissible dioptre limits for your specific entry route, even if your post-operative vision is 6/6. Consult your surgeon about your target entry’s specific limit before proceeding.
