Accuracy Of Ora Vlynk Intraoperative Aberrometry Versus Preoperative Biometry In Short And Long Eyes

The objective of this study was to collect clinical refractive data using the ORA VLynk intraocular lens power calculation system and to compare them with theoretical calculations of intraocular lens power using ocular biometry in eyes with short axial length (less than 22.1 mm) and long (greater than 25 mm) with implantation of a monofocal lens. 

This two-center prospective study was approved by the Ethics Committee de la Investigación con Medicamentos (Cádiz, Spain) and was registered at the DRKS German Clinical Trials Register (DRKS00028106). The inclusion criteria were: be able to attend all the study visits, >40 years old, have good eye health without any pathology that compromises visual acuity (except for residual refractive error), patients with an indication for monofocal intraocular lens (IOL) implantation (AcrySof IQ SN60WF), eyes with an axial length <22.1 mm (short) and with an axial length >25 mm (long). The exclusion criteria considered were: corneal opacity, previous corneal surgery, vitrectomy, diabetic retinopathy, keratoconus, amblyopia and/or strabismus. 

Preoperative IOL power calculation was performed using the Hoffer Q, Holladay 2, Haigis, SRK/T, Barrett Universal II and Barrett True-K formulas, as well as intraoperatively with the ORA VLynk system. Postoperatively, an evaluation of refractive error was performed. With this information, a study of the difference between the spherical equivalent calculated with the different formulas and that obtained after surgery was carried out. The power of the implanted lens was determined by the ORA VLynk IOL power calculation system. 50 patients were considered and the difference between predicted and postoperative spherical equivalent, and proportion of eyes within ±0.50D and ±1.00D of their target spherical equivalent refraction were calculated.