Seeing eye-to-eye - Eye tracking and disease
On-screen vision studies are conducted in the field of ophthalmology, for both basic medical research as well as for investigating related eye diseases. The results of these studies assist in furthering our understanding of the human eye and vision, while also developing innovative approaches to diagnosing disease.
Areas of ophthalmology involving eye and gaze tracking solutions are:
- Vision testing / screening
- Refractive surgery
Advanced eye movement research in ophthalmology and vision research requires fast and reliable eye movement data, an easy setup and efficient operation, as well as a comfortable human interface with integrated analysis functions.
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Use of 3D Video-Oculography for cyclotorsion research
The Department of Strabismology and Neuroophthalmology at the University of Giessen, Germany, used binocular 3D IR video-oculography to determine a possible influence of body position on cyclotorsion.
The research team wish to investigate whether positionally induced cyclotorsion could be an important factor concerning the correction of astigmatism in refractive surgery, 19 healthy subjects, (median age 25.5) with normal binocular vision were examined using SMI's 3D-VOG. This method records ocular motions and positions of both eyes simultaneously in the x, y, and z axis. Cycloposition of the eyes was recorded first in a seated position (both eyes open, test 1), then in a supine position (right eye closed, test 2), occlusion of both eyes (test 3), both eyes open (test 4). Cyclovergence was calculated as the difference between the right and the left eye positions.
The results of the investigations showed that the range of cyclotorsion of the right and left eye in all four tests was between 1.13° excyclotorsion and 0.34° incyclotorsion. There was no statistically significant difference in the median values for torsion in all four test situations. Concerning the influence of body position on cyclotorsion, a statistically significant difference between the different test positions and settings did not exist.
The team thus concluded that cyclotorsion does not significantly change between seated and supine position in subjects with normal binocular vision and stable fixation. In these subjects, an erroneous refractive surgery due to incorrect measurement of the axis of astigmatism in the seated position and performing the refractive surgery in the supine position, is very unlikely.