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Pachymetry is the measurement of corneal thickness, reported in micrometers. Thickness influences intraocular pressure readings, refractive surgery eligibility, and corneal disease assessment. Normal central corneas measure roughly in the mid five hundreds, with natural variation. Tracking change over time helps detect edema or thinning disorders.
read more about pachymetry ...Clinics use ultrasound probes, optical coherence tomography, or Scheimpflug imaging to capture thickness maps. Contact methods require brief anesthesia, while non contact devices scan across the cornea. Modern maps show central, paracentral, and peripheral values. Consistent technique improves comparison between visits.
Thickness patterns help distinguish normal variation from early disease. Central thinning can signal keratoconus, while uniform profiles often support routine care. Comparing maps over time shows whether changes are stable or progressive. This information supports lens fitting, refractive planning, and glaucoma assessment.
Thicker corneas can resist indentation and yield higher tonometry values, while thinner corneas can read lower than true pressure. Interpreting pressure with thickness in mind gives a more accurate risk picture. This context is useful when screening for glaucoma. Clinicians record both numbers in the chart.
Refractive surgery removes tissue, so adequate residual thickness is needed to maintain shape and stability. Maps help pick safe candidates and choose techniques like PRK, LASIK, or SMILE. Irregular patterns may point to early keratoconus. Careful review protects long term corneal health.
Intervals depend on risk and diagnosis. Stable healthy eyes might only need baseline values, while edema or ectasia suspects require closer tracking. After surgery, checks confirm healing and stability. Your clinician sets a schedule that fits your case.
Does it hurt? No, testing is quick and comfortable.
Are readings the same across devices? Small differences occur, so comparisons should use the same machine.
Can contact lenses affect results? Short term removal before testing avoids transient changes.
Pachymetry Test. Cleveland Clinic. https://my.clevelandclinic.org/health/diagnostics/17689-pachymetry-test. Updated February 21, 2024.
Keratoconus. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK470435/. Last Update: April 12, 2024.
Corneal Topography | Treatment & Management. StatPearls Point-of-Care. https://www.statpearls.com/point-of-care/144054. Published September 4, 2023.
Corneal Imaging. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK562157/. Published 2023
Central Corneal Thickness and Glaucoma Risk: The Importance of Corneal Pachymetry. Dovepress (Clinical Ophthalmology). https://www.dovepress.com/central-corneal-thickness-and-glaucoma-risk-the-importance-of-corneal--peer-reviewed-fulltext-article-OPTH. Published 2025