title: Accuracy and precision of a new system for measuring toric intraocular lens axis rotation.
abstract: We determined the accuracy and precision of a new system for measuring postoperative toric intraocular lens (IOL) axis rotation. The system performs high-resolution retroillumination photography to identify toric IOL axis markings and then takes a photograph of the iris and conjunctival/scleral vessels. Built-in software measures the toric axis to within 0.2 degree. If performed twice on the same eye, the system will correct the 2 toric axis measurements for cyclorotation/head tilt using iris/vessel registration. Testing in 37 eyes showed that using iris/vessel registration correction reduced the mean absolute toric IOL axis rotation by a factor of 4.5. We conclude that this system seems to be both accurate and precise for measuring postoperative toric IOL axis rotation.
authors.affiliation: Center for Clinical Research, Elmhurst, Sarver and Associates, Carbondale, Illinois 60126, USA. drsmd@drsmd.com
authors.forename: Donald R
authors.initials: DR
authors.lastname: Sanders
authors.forename: Edwin J
authors.initials: EJ
authors.lastname: Sarver
authors.forename: David L
authors.initials: DL
authors.lastname: Cooke
mesh_terms: D015415:Biomarkers; D019781:Corneal Topography; D006801:Humans; D007498:Iris / Q000098:blood supply*; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D018918:Phacoemulsification; D010781:Photography / Q000379:methods*; D011184:Postoperative Period; D015203:Reproducibility of Results; D012399:Rotation
chemical_list: D015415:Biomarkers