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Stereo topography may provide more accurate corneal measurements
NICE, France — A stereo topography unit that may improve upon the shortcomings of monocular topography units was described in a presentation here at the European Society of Cataract and Refractive Surgeons meeting.
The system, which is currently in development by LaserSight Technologies, will provide more accurate measurements of the surface of the cornea, according to Jack T. Holladay, MD, LaserSight's medical director.
“This system gives you the ability to calculate every single individual point on the cornea because you have a reference of more than one point to go from,” Dr. Holladay said.
Traditional topography units focus one camera on the central vertex of the cornea, allowing for only one reference point. The system in development by LaserSight uses three cameras; two cameras can triangulate each individual point of the cornea while a third is focused on the central vertex, Dr. Holladay said. The central camera has a symmetrical view of the cornea, and the other two cameras have oblique views of the center of the cornea, he said.
The unit will also measure pachymetry using slits projected on the cornea and a patented 8-point cross in a scan that takes 2.3 seconds. It will also be capable of pupillometry and run a Holladay Diagnostic Summary, as do several other LaserSight devices, Dr. Holladay said.