The stability rule
Most surgeons want your prescription to have changed by no more than 0.50 D in the past 12 months, ideally documented on two exams. Some accept 0.25 D of change; some want two years of stability for high myopes. The reason is simple: LASIK freezes the cornea's shape at one moment. If the eye keeps elongating afterward, myopia returns and you are back in glasses with less cornea to work with.
When eyes stop changing
Myopia progression typically slows by the late teens and stops for most people between 21 and 25. Heavy near work (medical school, coding, law) can push progression a little later. Women who are pregnant or breastfeeding see temporary refractive shifts and are asked to wait; see LASIK and pregnancy.
What documents you need
- Your glasses or contact lens prescriptions from the past two to three years, with dates. Old prescriptions are the single most useful thing you can bring to a Colombian consult; read why old prescriptions matter.
- A note of when you last changed lenses and why
- Your contact lens brand and wearing schedule, so the clinic can set the washout period
The keratoconus watch in your early twenties
Keratoconus, the corneal weakening that makes LASIK dangerous, most often declares itself between the mid-teens and mid-twenties. A 22-year-old with rising astigmatism and a prescription that keeps changing is exactly the patient screening is designed to catch. Corneal tomography at the consult is essential in this age group, and borderline maps in a young patient usually mean waiting a year and re-scanning, or choosing PRK or ICL, rather than proceeding with LASIK. See post-LASIK ectasia.
Timing around life
| Situation | Advice |
|---|---|
| College or grad school | Do it over a break; laser recovery is a few days, but exams and heavy reading in the first week are unpleasant |
| Starting a job | Surgery before the start date or during onboarding downtime; avoid the first busy month |
| Military, police, fire academy | Check the branch's refractive surgery policy on procedure type and waiting period before applying; see pilots and military |
| Long backpacking trip through Latin America | Have surgery at the start of the trip, spend the first week somewhere calm, and enjoy the rest without contacts |
Why Colombia appeals to this age group
Price is the honest reason: USD 1,700 to 2,600 for both eyes in Medellín or Bogotá versus USD 4,000 to 6,000 in the US, on the same laser platforms. A twenty-something without an employer vision plan and with a decade of contact lens costs ahead has the strongest financial case for surgery of any age group. See the lifetime cost comparison.
Do not have LASIK in your 20s if
- Your prescription moved more than 0.50 D in the last year
- Tomography is borderline and you have not been re-scanned after a year
- You cannot stop contact lenses for the required washout before the consult
- You are being offered same-day surgery with no dilated exam
Frequently asked questions
Is 21 too young for LASIK?
Not necessarily. Most surgeons treat from 18 to 21 upward if the prescription has been stable for a year and tomography is normal.
What if my prescription changed 0.75 D last year?
Most surgeons will ask you to wait and re-check in 6 to 12 months. Operating on a changing eye risks regression.
Can I have LASIK during a gap year in Colombia?
Yes. Plan the consult and surgery at the start, with a calm first week, so you have weeks of follow-up available before moving on.
Ready to check candidacy?
Send your last three prescriptions and your age. We will tell you whether a Colombian surgeon would consider you stable enough and what to expect from screening.
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