Corneal Biomechanics in Eyes Implanted With Small-Aperture Corneal Inlay
Narrative Responses:
Purpose
To compare the postoperative biomechanical properties of eyes implanted with a small aperture corneal inlay versus fellow eyes.
Methods
Medical records of patients who had a small aperture corneal inlay (KAMRA®, AcuFocus, Inc.) implantation in our clinic were retrospectively reviewed. Emmetropic patients who had the implantation in a stromal pocket and who had preoperative and postoperative corneal hysteresis (CH) and corneal resistance factor (CRF) measurements using the Ocular Response Analyser were included in the study. Inlay implanted eyes constituted Group 1 and the non-implanted fellow eyes constituted Group 2. Main outcome measures were corneal hysteresis (CH), corneal resistance factor (CRF) and Goldmann applanation tonometry measurements performed preoperatively and at postoperative month 1, 3 and 6 visits.
Results
The study included 68 eyes of 34 patients.In Group 1, CH values were 10.64±1.43mmHg, 12.29±2.46 mmHg, 10.86±3.21 mmHg and 10.89±2.97 mmHg at preoperative, month 1, month 3 and month 6 visits. In Group 2, CH values were 11.02±1.90mmHg, 10.89±1.78 mmHg, 10.70±1.93 mmHg and 10.85±1.67 mmHg at the same visits.In Group 1, CRF values were 10.61±1.48mmHg, 12.52±2.45 mmHg, 10.40±2.78 mmHg and 10.67±2.71 mmHg at preoperative and months 1, 3 and 6 visits. In Group 2, CRF values were 10.97±2.07mmHg, 10.42±1.48 mmHg, 10.35±1.82 mmHg and 10.53±1.81 mmHg at the same period. There was no significant change in the Goldmann applanation tonometry measurements.
Conclusion
The differences in CH and CRF between Inlay-implanted eyes and the non-implanted control eyes in our study confirm a slight difference in corneal biomechanical structure in the 1 month postoperative period.