NCT03856346

Intraocular Lens Power Calculation for Combined Phaco-vitrectomy Procedures

Intraocular Lens Power Calculation for Combined Phaco-vitrectomy Procedures: Calculation of a New Constant for Biometry IOL-formulas

• Status: Unknown
• Phase: —
• Study type: Observational
• Enrollment: 200 (estimated)
• Sponsor: Cantonal Hospital of St. Gallen · Academic / Other
• Sex: All
• Age: 18 Years – 99 Years
• Healthy volunteers: Accepted

Summary

The aim of the study is to evaluate the degree of refractive error postoperatively in combined procedures and to calculate a new constant in order to improve current state of the art biometry calculations.

Detailed description

The IOL power calculation in combined phaco-vitrectomy has been performed similar to that in cataract surgery alone. In patients who undergo combined phaco-vitrectomy, deviations in refractive outcomes may be observed because of possible errors in measurement of axial length, changes in the properties of the vitreous cavity after removal of the vitreous, or intraocular tamponade. Most of the previous studies have reported variable degrees of myopic shift after phaco-vitrectomy for diabetic retinopathy, epiretinal membrane, and macular hole. Furthermore, use of intraoperative gas may increase further the risk of anterior displacement of the intraocular lens which may induce a higher myopic shift. However, these publications did not provide any quantification of the spherical deviations nor calculate any specific constant in order to improve currents state of art biometry calculations.

Conditions

• Intraocular Lens Calculation
• Combined Phaco-vitrectomy

Interventions

Type	Name	Description
DIAGNOSTIC_TEST	Biometry	Biometry for phaco-vitrectomy procedures pre- and postoperatively

Timeline

• Start date: 2019-06-01
• Primary completion: 2020-06-30
• Completion: 2020-09-30
• First posted: 2019-02-27
• Last updated: 2019-05-02

Locations

1 site across 1 country: Switzerland