Intraocular pressure changes and corneal biomechanics after hyperopic small incision lenticule extraction
Session Details
Session Title: Small Lenticule Extraction I
Session Date/Time: Sunday 15/09/2019 | 08:00-10:00
Paper Time: 09:42
Venue: Free Paper Forum: Podium 1
First Author: : X.Zhou CHINA
Co Author(s): : D. Fu M. Li
Abstract Details
Purpose:
To compare intraocular pressure (IOP) measurements by a dynamic Sheimpflug analyzer (Corvis ST), noncontact tonometer, and ocular response analyzer after hyperopic small incision lenticule extraction (SMILE).
Setting:
EENT Hospital of Fudan University.
Methods:
Thirteen patients who underwent hyperopic SMILE in one eye each, were prospectively enrolled. The IOP and corneal biomechanical parameters were measured preoperatively and 1 week, 1 month, and 3 months after surgery with a noncontact tonometer (IOPNCT), Corvis ST (biomechanical corrected IOP, bIOP), ocular response analyzer (Goldmann correlated intraocular pressure [IOPg], cornea compensated IOP [IOPcc], corneal resistance factor [CRF], and corneal hysteresis [CH]). A linear mixed model was used to compare IOP values among the four methods at each point.
Results:
At the last visit, the safety index was 0.96±0.12, the efficacy index was 0.93±0.14. IOPNCT, IOPg, and IOPcc dropped significantly after surgery, with the amplitude being 3.15±0.48, 5.49±0.94, and 4.34±0.97 mmHg, respectively. IOPNCT decreased by 0.11±0.06 mmHg per removed central corneal thickness (μm). bIOP kept agreeable during the follow-up. Before surgery, no difference was found among the four measurements. After surgery, IOPNCT and bIOP were higher than IOPg and IOPcc. IOPNCT at the last visit was correlated with preoperative IOPNCT (r=0.82, P=0.001), and CRF at 3 months (r=0.89, P=0.001).
Conclusions:
IOPNCT decreased after hyperopic SMILE, and its value is correlated with preoperative IOPNCT and corneal biomechanical properties. bIOP is an appropriate parameter to assess postoperative IOP.
Financial Disclosure:
None
