PubMed · 6703962
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B Kurwa. 1984. A simplified method for analyzing data from the three-step test.. https://doi.org/10.1001/archopht.1984.01040030013007
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A video-based 2D eye-tracking system (EyeLink version 2.04, SR Research Ltd/SMI) was compared with the scleral search coil technique for its performance on recording the properties of fixations and saccadic eye movements. Fixation positions and saccadic properties (amplitude, duration, and peak velocity) were calculated independently from the data of the two systems that recorded eye positions simultaneously. Fixation positions were well correlated between the video and the coil output with an average discrepancy of <1 degree over a tested range of 40 by 40 degree of visual angle. With respect to the saccade analysis, the values measured by the video system were fitted as a linear function of the values measured by the coil system. Highly correlated linear fits with slopes near one were obtained for all the saccadic parameters. Main sequence relationships (amplitudes-duration and amplitude-peak velocity) were also similar for both systems. A disadvantage of the video method is its low sample rate of 250 Hz. The relatively noisier estimate of all parameters of small saccades could be attributed to this low sampling frequency.
Surgical counter-rotation after macular translocation is indicated when a non-fusionable cyclodeviation exists by lack of suppression. Different surgical options exist to counter-rotate the globe after macular translocation. Primary angles of retinal rotation up to 40 degrees can be compensated for.
OBJECTIVE: To compare the success rates for strabismus surgery designed to correct limitation of duction with surgery designed to correct deviation in patients with Graves' ophthalmopathy. DESIGN: Retrospective nonrandomized comparative trial. PARTICIPANTS: One hundred thirty-seven patients with Graves' ophthalmopathy who had undergone at least one extraocular muscle surgery were divided into two groups: those whose first surgery occurred before June 1997 (control group) and those whose first surgery occurred in June 1997 or thereafter (case group). INTERVENTIONS: Extraocular muscle surgery primarily directed at either correcting deviation (control group) or correcting limitation of ductions (case group). MAIN OUTCOME MEASURES: Postoperative deviations in the primary position were measured in prism diopters 30 to 180 days after surgery. A postoperative deviation of less than 5 diopters was considered a successful surgical outcome. RESULTS: Patients undergoing strabismus surgery specifically designed to correct limitation of duction achieved a 74% success rate compared with a 44% success rate in the control group (P < 0.01). Furthermore, the rate of reoperation in this group was only 27% compared with 44% in the control group (P < 0.04). CONCLUSIONS: Compared with surgery aimed primarily at the correction of deviation, extraocular muscle surgery tailored to address restriction of ductions in patients with Graves' ophthalmopathy is associated with improved surgical success of initial realignment and with a lower rate of reoperation