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Videokeratography in conductive keratoplasty
Shamim A Haji1, Daniel C Brocks, Magid M Fahim
1Department of Ophthalmology, Mount Sinai School of Medicine, New York, NY, USA.
Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|August 17, 2004
Summary
Conductive keratoplasty effectively corrects hyperopia by altering corneal shape, improving uncorrected vision and refractive outcomes. The procedure demonstrates safety, maintaining visual acuity and corneal parameters over 12 months.
Area of Science:
- Ophthalmology
- Refractive Surgery
- Corneal Physiology
Background:
- Conductive keratoplasty (CK) is a refractive surgical procedure utilizing radiofrequency energy to reshape the cornea.
- CK aims to correct hyperopia by inducing controlled corneal steepening.
Purpose of the Study:
- To evaluate corneal shape changes after conductive keratoplasty using EyeSys videokeratography.
- To assess the refractive and visual outcomes of CK for hyperopia correction.
Main Methods:
- EyeSys videokeratography was employed to analyze corneal topography.
- Measurements included manifest refractive spherical equivalent refraction (MRSE), visual acuities (UCVA, BSCVA), and various topographical parameters.
- Data were collected preoperatively and at 6 and 12 months postoperatively for 19 eyes.
Main Results:
- Mean uncorrected visual acuity (UCVA) improved significantly (LogMAR 0.53 to 0.10).
- Mean MRSE shifted from hyperopic (+1.62 D) to near-emmetropic (-0.06 D).
- Best spectacle-corrected visual acuity (BSCVA), predicted corneal acuity (PCA), and corneal uniformity index (CU Index) remained stable.
Conclusions:
- Conductive keratoplasty provides safe and effective hyperopic correction with stable visual outcomes at 12 months.
- Changes in average simulated keratometry (Avg Sim K) and effective refractive power support the refractive results.
- A slight, transient regular astigmatism was observed, and increased corneal asphericity may indicate central and peripheral corneal alterations.