An interventional study of Corneal steady-state biomechanical measurement device, Pentacam and Corvis ST and Pentacam and Corvis ST in Corneal Biomechanics and Refractive Surgery, sponsored by Tianjin Eye Hospital. Recruiting at 1 site in China. Per ClinicalTrials.gov, last updated 2026-11-10.
Sponsored by Tianjin Eye Hospital · Not applicable, Interventional, and Treatment
This study aims to evaluate the accuracy of corneal Young's modulus measurements (E_CID and E_Steady-State) obtained using a steady-state corneal biomechanical measurement device in patients scheduled to undergo refractive surgery and to explore their potential applications in assisting refractive surgical procedures.
Tianjin Eye Hospital is the lead sponsor of 53 studies on the registry; 18 are open to participants now.
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Device: Pentacam and Corvis ST
Device: Corneal steady-state biomechanical measurement device, Pentacam and Corvis ST
Participants wear negative-pressure goggles, and a pressure test is performed to ensure an adequate seal. They then position their chin on the chinrest and fixate on a target while the operator aligns the imaging system with the cornea. The device applies controlled negative pressure and captures corneal deformation images using a Scheimpflug camera, with a coaxial imaging system assisting in alignment and monitoring eye movements. Following data acquisition, the software analyzes corneal biomechanical parameters and generates an assessment report.
Morphological and biomechanical parameters were obtained by Pentacam and Corvis ST
Postoperative residual refractive error
Time frame: One year
Visual acuity
Time frame: One year
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
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Tianjin Eye Hospital