Many patients achieve excellent corrected acuity with glasses or contact lenses.
That does not guarantee structural suitability for corneal laser.
Laser surgery depends on biomechanical safety, not simply optical clarity.
Eyes with subtle tomography abnormalities may still achieve 6/6 with spectacles yet carry elevated ectasia risk. ¹
Studies examining post-LASIK ectasia show that some affected patients had normal corrected acuity pre-operatively. ²
A full suitability assessment includes:
- Corneal thickness
- Posterior elevation
- Pachymetric distribution
- Percent tissue altered modelling
- Ocular surface evaluation
Vision charts measure focus.
They do not measure structural reserve.
At Blue Fin Vision®, screening looks beyond acuity.
An eye that functions perfectly in glasses may still not tolerate tissue removal safely.
Suitability is defined by stability, not spectacle performance.
References
- Ambrosio R Jr, Belin MW. Tomographic screening for ectasia risk. J Refract Surg. 2010;26(11):847-849.
- Randleman JB, et al. Risk assessment for ectasia. Ophthalmology. 2008;115(1):37-50.
- Santhiago MR, et al. Percent tissue altered and ectasia risk. Am J Ophthalmol. 2014;158(1):87-95.
Related Topics
- Who Should Not Have Laser Eye Surgery, and Why Saying “No” Can Protect Your Vision
- Why Thin Corneas Can Make Laser Eye Surgery Unsafe
- Percent Tissue Altered (PTA): The Biomechanical Threshold That Can Rule Out LASIK
- Why Normal Topography Isn’t Always Enough to Clear You for Laser Eye Surgery
- Keratoconus: Why Laser Eye Surgery Is Contraindicated
- Subclinical Keratoconus: When a Borderline Scan Still Means No
- Can I Have Laser Eye Surgery If I Have Dry Eyes?
- Severe Dry Eye and LASIK: When Symptoms Make Surgery Too Risky
- Is My Prescription Too High for Safe Laser Eye Surgery?
- High Myopia and LASIK: Understanding the Tissue Safety Limits
- Laser Eye Surgery and Retinal Disease: When We Must Defer
- Why Active Macular Pathology Is a Red Flag for Laser Vision Correction
- Am I Too Young for Laser Eye Surgery? Understanding Age and Prescription Stability
- Unstable Refraction: Why We Often Say “Not Yet”
- Is Laser Eye Surgery Safe If You Play Contact or Combat Sports?
- LASIK and High-Impact Jobs: When Trauma Risk Tips the Balance
- Large Pupils, Night-Time Halos and LASIK: When We Advise Against Surgery
- Autoimmune Disease, Systemic Medications and LASIK: Who Should Not Proceed?
- I Was Told I’m Not Suitable for Laser – What Safe Alternatives Do I Have?
- Why a Perfect Eye Test Doesn’t Guarantee You’re Suitable for Laser
- Is My Prescription Still Changing? Why Stability Matters Before Laser Eye Surgery
- Pregnancy, Breastfeeding and Laser Eye Surgery: Why We Defer
- Monocular Patients: When One Seeing Eye Changes the Threshold
- Previous Corneal Surgery: Why Prior Procedures Change Suitability
