The definitive answer comes from a comprehensive pre-operative examination. But several preliminary indicators can tell you whether to expect good candidacy news before you schedule — and which procedure is most likely to be recommended for your profile.
This question is addressed in detail in the Vision Correction Procedures Compared hub, particularly at How to Determine Which Vision Correction Procedure Is Right for You.
Featured Snippet: Candidacy Checklist
You are likely a good candidate if:
- You are 18 or older (21+ for some procedures)
- Your prescription has been stable for at least 2 years
- You have adequate corneal thickness (>480 microns for laser surgery)
- You do not have active eye disease (keratoconus, significant glaucoma, uncontrolled dry eye)
- Your prescription is within the treatable range of at least one procedure
- You are in generally good health
You may need a specialized procedure (EVO ICL or RLE) if:
- Your prescription is very high (above -10.00D myopia or above +4.00D hyperopia)
- Your corneas are thin
- You have significant dry eye disease
You may not be a candidate if:
- You have active keratoconus
- Your prescription is still changing significantly
- You have a condition that affects corneal healing
What the Pre-Operative Exam Measures
The pre-operative evaluation is a comprehensive diagnostic session that answers the candidacy question definitively. It includes:
Corneal topography: A detailed map of your corneal curvature. Detects irregular patterns that may indicate early keratoconus or other contraindications.
Corneal tomography (Pentacam/Scheimpflug): 3D imaging of the entire cornea from front to back. Provides corneal thickness measurements at multiple points and detects early ectatic disease more sensitively than topography alone.
Pachymetry: Central corneal thickness measurement. Determines whether adequate tissue remains for safe laser ablation.
Wavefront analysis: Maps your eye’s optical imperfections beyond simple prescription — the higher-order aberrations that affect vision quality.
Anterior chamber depth: Required specifically for EVO ICL candidacy. Confirms adequate space for the lens.
Dry eye assessment: Tear break-up time, Schirmer testing, meibomian gland evaluation. Determines pre-surgical dry eye severity.
Dilated retinal examination: Reviews the health of the retina and optic nerve.
Pupil size in dim lighting: Relevant to halo risk assessment for laser procedures.
This typically takes 60–90 minutes. Plan to have someone drive you home — your pupils will be dilated and vision will be temporarily blurred.
Preliminary Self-Assessment
While a pre-operative exam is the only definitive answer, these factors point toward likely candidacy:
Strong preliminary indicators for LASIK or PRK candidacy:
- Myopia in the -1.00D to -8.00D range or hyperopia up to +4.00D
- Age 18–45 with stable prescription for 2+ years
- No history of eye disease beyond routine refractive error
- No significant dry eye symptoms
- No family history of keratoconus
Preliminary indicators for EVO ICL candidacy:
- Myopia above -8.00D with otherwise healthy eyes
- Thin corneas confirmed by prior measurement
- Adequate anterior chamber depth (usually assessable at a standard optometry visit)
Preliminary indicators for RLE:
- Age 50+ with presbyopia
- High hyperopia or myopia beyond laser range
- Any prescription with developing cataract
One Important Caution
Pre-operative evaluations at many high-volume commercial centers are designed with conversion to surgery as the implicit goal. If you receive a pre-operative evaluation and are immediately scheduled for surgery without a detailed explanation of your specific candidacy factors, consider seeking a second opinion at a practice with a more consultative approach.
The best practices — including those recognized in our LASIK Surgery Awards and EVO ICL Awards — will explain your corneal measurements, your topographic findings, and which procedures you qualify for medically before discussing cost or scheduling.
Related Resources
- What Happens During a Vision Correction Consultation?
- Can I Get Vision Correction If I Have Dry Eyes?
- What Is the Best Vision Correction Surgery?
*This content is educational and does not constitute medical advice.*