Related Experiment Video
Updated: Jun 2, 2026
05:14
Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
Published on: September 16, 2025
Intraocular pressure instrument reading comparisons after LASIK.
Summary
Corrected Goldmann applanation tonometry (cGAT) shows fair agreement with Ocular Response Analyzer (ORA) intraocular pressure (IOP) readings after laser in situ keratomileusis (LASIK). Corneal resistance factor (CRF) influences IOP measurements in post-LASIK eyes.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Corneal Biomechanics
Background:
- Accurate intraocular pressure (IOP) measurement is crucial for glaucoma management.
- Laser in situ keratomileusis (LASIK) alters corneal biomechanics, potentially affecting IOP readings.
- Existing tonometry methods may require adjustments for post-LASIK eyes.
Purpose of the Study:
- To assess the agreement between Ocular Response Analyzer (ORA) and corrected Goldmann applanation tonometry (cGAT) IOP measurements in post-LASIK eyes.
- To investigate the influence of corneal biomechanical properties on IOP readings after LASIK.
Main Methods:
- Retrospective cross-sectional study of 148 post-LASIK eyes.
- IOP measured using ORA and Goldmann applanation tonometry (GAT).
- cGAT calculated using a post-LASIK correction formula; corneal hysteresis and corneal resistance factor (CRF) measured by ORA.
Main Results:
- Mean IOP readings: GAT 10.09±2.43, cGAT 13.34±2.52, IOPg 9.79±2.52, IOPcc 13.91±2.26 mmHg.
- Mean difference between IOPcc and cGAT was 0.63±1.31 mmHg (p<0.05).
- Significant correlation found between cGAT and CRF, but not with corneal hysteresis.
Conclusions:
- Corrected GAT (cGAT) shows fair agreement with ORA's IOPcc in post-LASIK eyes.
- Corneal biomechanical properties, particularly CRF, may impact IOP measurement accuracy after LASIK.
- The findings may aid in more reliable IOP assessment in patients who have undergone LASIK.
