Both Eyes on the Same Day? Weighing Bilateral LASIK on a Medellín Trip

The decision most travelers never realize they are making

If you fly to Medellín for vision correction, the default assumption is that both eyes will be done in one visit, and very often in one session. It is efficient: one surgery day, one recovery period, one flight home. Many patients never hear that there is any alternative.

There is. Some surgeons and patients choose to treat one eye, wait, and then treat the other. In the language of eye surgery, treating both eyes together is called bilateral simultaneous or same-day bilateral treatment; treating them on separate occasions is called sequential treatment. This article explains the trade-off so you can have an informed conversation, not so you can overrule your surgeon.

What the FDA says

The FDA's patient guidance lists treating both eyes on the same day among the topics patients should understand, and describes it as riskier than having two separate surgeries (FDA, 2018). It gives two reasons:

1. No preview. When both eyes are treated at once, there is no chance to see how the first eye responds and heals before the second eye is treated.
2. No "good eye" in early recovery. Both eyes may be blurry during initial healing, so you have no clear eye to rely on for the first days.

Notice what the FDA does not say. It does not say same-day treatment is inappropriate, and it does not give a rate. It frames this as a trade-off patients should consider. The sensible response is to ask your surgeon how they weigh it for your eyes.

The trade-off, side by side

For most international patients, the travel rows weigh heavily, and same-day treatment is often what surgeons recommend. For some patients, the clinical rows matter more. The point is that the right answer depends on the person.

Situations worth discussing in more depth

There is no published checklist that dictates when to separate the eyes, and the choice belongs to your surgeon and you. But some situations naturally invite a longer conversation:

• Borderline findings at evaluation. If anything in your measurements gave the surgeon pause, ask whether seeing the first eye heal would add useful information.
• Very different prescriptions between your eyes. Ask how the plan handles that, and whether treating one eye first changes anything.
• Monovision. If one eye is being set for distance and the other for near, you may have trialed this with contact lenses. Ask whether the surgeon would treat both at once. Our monovision guide covers the trial process.
• Healing concerns. The FDA lists conditions such as autoimmune disease and diabetes, and medications such as steroids, as factors that can affect healing. If any applies to you, ask how it shapes the plan.
• Only one good eye. If one eye has reduced vision for another reason, surgery planning is different altogether, and you should discuss it in depth.
• Anxiety about having no clear eye. Your comfort is a legitimate factor. Say so.

What sequential treatment looks like for a traveler

If you and your surgeon decide on one eye at a time, the logistics change. The interval between eyes is your surgeon's decision and depends on the procedure and how the first eye heals. You have two broad options:

One longer stay

Remain in Medellín for the interval. This works best for people who can work remotely or who already spend extended time in the city. Plan for a period with one treated eye and one uncorrected eye, which can feel unbalanced. Keep your glasses or a contact lens for the untreated eye only if your surgeon agrees.

Two trips

Fly home after the first eye and return for the second. This doubles travel costs and time off, and it means the first eye's follow-up happens partly at home. Ask whether your home eye doctor can do interim checks and send results to the surgeon.

If you go with same-day treatment: plan the first 48 hours

The FDA's point about having no clear eye during early healing is mostly a practical one, and it is the part you can plan for.

• A companion for surgery day. The FDA advises arranging for someone to take you home because your vision may be blurry. With both eyes treated, have that person stay with you for the rest of the day if possible.
• Lodging you can navigate. Choose a place you have already seen in daylight, with an elevator or few stairs, and no complicated entry.
• Drops you can manage. Ask your clinic for a written schedule in large print, label bottles clearly, and set phone alarms. A companion can help with the first doses.
• The shield. The FDA advises wearing an eye shield to prevent rubbing during sleep while the flap heals. With both eyes shielded, set out water and your phone where you can find them by touch.
• The next-day visit. The FDA advises a first follow-up within 24 to 48 hours. Book the transport in advance; you should not be arranging taxis with blurry vision.

Traveling as a couple or with a friend

If two of you are having surgery on the same trip, do not plan to be each other's support on the same day if you are both having both eyes done. Stagger the surgery days so someone can see clearly. This site has a separate guide to scheduling a couples trip.

Questions to ask your surgeon

1. "Do you recommend treating both eyes the same day for me, and why?"
2. "Is there anything in my measurements that makes you want to see the first eye heal first?"
3. "If something unexpected happens with the first eye during surgery, what would you do about the second?"
4. "If I preferred one eye at a time, what interval would you suggest, and how would that change the cost?"
5. "What should I expect to see on the evening of surgery and the next morning?"

The third question is especially useful. A thoughtful surgeon will have a clear answer about pausing if the first eye does not go as planned. Hearing it in advance is reassuring, and it shows you that the decision is being made eye by eye even when both are treated on the same day.

Bottom line

Same-day treatment of both eyes is a reasonable and common plan for many international patients, and the travel savings are real. The FDA is also right that it gives up two safety margins: a preview of healing, and a clear eye during recovery. Knowing that, you can ask better questions, plan better support, and make the choice deliberately rather than by default.

Frequently asked questions

Do most LASIK clinics treat both eyes on the same day?

Same-day treatment of both eyes is a common approach in many practices, but practice varies by surgeon, procedure and patient. Ask your Medellín surgeon what they recommend for you and why, rather than assuming either way.

Why would anyone treat one eye at a time?

The FDA notes that treating one eye first lets the surgeon and patient see how it heals before treating the second, and leaves one eye unaffected during early recovery. Some patients and surgeons prefer that cautious approach, especially when there is a particular concern from the evaluation.

Will I be able to see at all after both eyes are treated?

Vision is often blurry right after surgery, and the FDA notes both eyes may be blurred during initial healing when they are treated together. Plan for someone to take you home and to help you for the rest of the day. Your surgeon will tell you what to expect for your procedure.

If I choose one eye at a time, how long between eyes?

That is your surgeon's call and depends on how the first eye heals and on the procedure. For travelers it can mean a longer stay or two trips. Ask for a realistic interval before booking flights.

Can I change my mind on surgery day?

You can always ask to pause or treat only one eye, and you should raise any concern before the procedure starts. It is far better to discuss the plan fully at the consultation so that surgery day holds no surprises.